{"id":9,"date":"2026-02-22T20:36:24","date_gmt":"2026-02-22T20:36:24","guid":{"rendered":"https:\/\/stavrosioannidis.gr\/?page_id=9"},"modified":"2026-03-02T13:46:09","modified_gmt":"2026-03-02T11:46:09","slug":"%ce%bc%ce%b1%ce%b8%ce%ae%ce%bc%ce%b1%cf%84%ce%b1","status":"publish","type":"page","link":"https:\/\/stavrosioannidis.gr\/en\/%ce%bc%ce%b1%ce%b8%ce%ae%ce%bc%ce%b1%cf%84%ce%b1\/","title":{"rendered":"Lessons"},"content":{"rendered":"<h4><strong data-start=\"499\" data-end=\"520\">\u03a3\u03c4\u03b1\u03cd\u03c1\u03bf\u03c2 \u0399\u03c9\u03b1\u03bd\u03bd\u03af\u03b4\u03b7\u03c2<\/strong><\/h4>\n<h2>\u039c\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03b1 \u039a\u03bb\u03b1\u03c1\u03af\u03bd\u03bf\u03c5<\/h2>\n<div>\n<p>\u03a0\u03c1\u03bf\u03c3\u03c6\u03ad\u03c1\u03c9 <strong data-start=\"1483\" data-end=\"1513\">\u03bc\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03b1 \u03ba\u03bb\u03b1\u03c1\u03af\u03bd\u03bf\u03c5 online<\/strong>, \u03c0\u03c1\u03bf\u03c3\u03b1\u03c1\u03bc\u03bf\u03c3\u03bc\u03ad\u03bd\u03b1 \u03c3\u03c4\u03b9\u03c2 \u03b1\u03bd\u03ac\u03b3\u03ba\u03b5\u03c2 \u03ba\u03ac\u03b8\u03b5 \u03bc\u03b1\u03b8\u03b7\u03c4\u03ae, \u03b1\u03bd\u03b5\u03be\u03b1\u03c1\u03c4\u03ae\u03c4\u03c9\u03c2 \u03b7\u03bb\u03b9\u03ba\u03af\u03b1\u03c2 \u03ae \u03b5\u03c0\u03b9\u03c0\u03ad\u03b4\u03bf\u03c5.<\/p>\n<\/div>\n<p><p>\n        <a href=\"\/book\">\u039e\u03b5\u03ba\u03b9\u03bd\u03ae\u03c3\u03c4\u03b5 \u03c4\u03bf \u03c0\u03c1\u03ce\u03c4\u03bf \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1 \u03c4\u03ce\u03c1\u03b1<\/a>\n    <\/p>\n<\/p>\n<ul>\n<li>\n<p>        <img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/02\/ChatGPT-Image-26-feb.-2026-11_53_19.png\" alt=\"\"><\/p>\n<h3><span class=\"uk-text-secondary\">\u039c\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03b1 <\/span> \u039a\u03bb\u03b1\u03c1\u03af\u03bd\u03bf<\/h3>\n<p><i uk-icon=\"calendar\" class=\"uk-text-secondary\"><\/i>\u03a4\u03bf \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 50 \u03bb\u03b5\u03c0\u03c4\u03ac. <br \/><i uk-icon=\"icon:money\" class=\"uk-text-secondary\"><\/i> 35 \u03b5\u03c5\u03c1\u03ce \u03b1\u03bd\u03ac \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1<\/p>\n<div>\n<div class=\"flex flex-col text-sm pb-25\">\n<article class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:18b16b9c-312c-4e59-b7c8-e63619b58da0-8\" data-testid=\"conversation-turn-16\" data-scroll-anchor=\"true\" data-turn=\"assistant\" tabindex=\"-1\">\n<div class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\">\n<div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\">\n<div class=\"flex max-w-full flex-col grow\">\n<div data-message-author-role=\"assistant\" data-message-id=\"f20efcd6-4503-4e10-aa9a-b7c2edc1036d\" dir=\"auto\" data-message-model-slug=\"gpt-5-2-thinking\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&amp;]:mt-1\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\">\n<div class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\">\n<p data-start=\"0\" data-end=\"22\" data-is-last-node=\"\" data-is-only-node=\"\"><strong data-start=\"0\" data-end=\"22\" data-is-last-node=\"\" data-is-only-node=\"\">\u039c\u03ac\u03b8\u03b7\u03bc\u03b1 \u03b3\u03b9\u03b1 \u03b5\u03c6\u03ae\u03b2\u03bf\u03c5\u03c2<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"z-0 flex min-h-[46px] justify-start\"><\/div>\n<div class=\"mt-3 w-full empty:hidden\">\n<div class=\"text-center\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<\/div>\n<div aria-hidden=\"true\" data-edge=\"true\" class=\"pointer-events-none h-px w-px absolute bottom-0\"><\/div>\n<\/div>\n<p><a href=\"\/book\/\">\u039a\u03bb\u03b5\u03af\u03c3\u03c4\u03b5 \u03ce\u03c1\u03b1<\/a><\/p>\n<\/li>\n<li>\n<p>        <img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/02\/ChatGPT-Image-26-feb.-2026-11_53_19.png\" alt=\"\"><\/p>\n<h3><span class=\"uk-text-secondary\">\u039c\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03b1 <\/span> \u039a\u03bb\u03b1\u03c1\u03af\u03bd\u03bf<\/h3>\n<p><i uk-icon=\"calendar\" class=\"uk-text-secondary\"><\/i>\u03a4\u03bf \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 50 \u03bb\u03b5\u03c0\u03c4\u03ac. <br \/><i uk-icon=\"icon:money\" class=\"uk-text-secondary\"><\/i> 40 \u03b5\u03c5\u03c1\u03ce \u03b1\u03bd\u03ac \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1<\/p>\n<div>\n<div class=\"flex flex-col text-sm pb-25\">\n<article class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:18b16b9c-312c-4e59-b7c8-e63619b58da0-8\" data-testid=\"conversation-turn-16\" data-scroll-anchor=\"true\" data-turn=\"assistant\" tabindex=\"-1\">\n<div class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\">\n<div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\">\n<div class=\"flex max-w-full flex-col grow\">\n<div data-message-author-role=\"assistant\" data-message-id=\"f20efcd6-4503-4e10-aa9a-b7c2edc1036d\" dir=\"auto\" data-message-model-slug=\"gpt-5-2-thinking\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&amp;]:mt-1\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\">\n<div class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\">\n<p data-start=\"0\" data-end=\"22\" data-is-last-node=\"\" data-is-only-node=\"\"><strong data-start=\"0\" data-end=\"22\" data-is-last-node=\"\" data-is-only-node=\"\">\u039c\u03ac\u03b8\u03b7\u03bc\u03b1 \u03b3\u03b9\u03b1 \u03b5\u03bd\u03ae\u03bb\u03b9\u03ba\u03b5\u03c2 <\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"z-0 flex min-h-[46px] justify-start\"><\/div>\n<div class=\"mt-3 w-full empty:hidden\">\n<div class=\"text-center\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n<\/div>\n<div aria-hidden=\"true\" data-edge=\"true\" class=\"pointer-events-none h-px w-px absolute bottom-0\"><\/div>\n<\/div>\n<p><a href=\"\/book\/\">\u039a\u03bb\u03b5\u03af\u03c3\u03c4\u03b5 \u03ce\u03c1\u03b1<\/a><\/p>\n<\/li>\n<\/ul>\n<p><!--more--><br \/>\n<!-- {\"type\":\"layout\",\"children\":[{\"type\":\"section\",\"props\":{\"image_position\":\"center-center\",\"style\":\"default\",\"title_breakpoint\":\"xl\",\"title_position\":\"top-left\",\"title_rotation\":\"left\",\"vertical_align\":\"middle\",\"width\":\"default\"},\"children\":[{\"type\":\"row\",\"children\":[{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\"}}]}]},{\"type\":\"section\",\"props\":{\"animation\":\"scale-up\",\"animation_delay\":\"50\",\"image_position\":\"center-center\",\"padding_bottom\":\"small\",\"padding_top\":\"none\",\"style\":\"muted\",\"title_breakpoint\":\"xl\",\"title_position\":\"top-left\",\"title_rotation\":\"left\",\"vertical_align\":\"middle\",\"width\":\"default\"},\"children\":[{\"type\":\"row\",\"props\":{\"css\":\".el-row{\\n    margin-top: -40px;\\n\\n}\\n@media screen and (min-width: 1100px){\\n.el-row{\\n    margin-top: -100px;\\n\\n}\\n}\"},\"children\":[{\"type\":\"column\",\"props\":{\"image\":\"wp-content\/uploads\/2026\/02\/notes.png\",\"image_effect\":\"parallax\",\"image_parallax_bgy\":\"-50 0%,50 100%\",\"image_position\":\"center-center\",\"media_background\":\"#EFCF4F\",\"padding\":\"large\",\"position_sticky_breakpoint\":\"m\",\"style\":\"card-default\",\"vertical_align\":\"middle\"},\"children\":[{\"type\":\"headline\",\"props\":{\"content\":\"<strong data-start=\\\"499\\\" data-end=\\\"520\\\">\u03a3\u03c4\u03b1\u03cd\u03c1\u03bf\u03c2 \u0399\u03c9\u03b1\u03bd\u03bd\u03af\u03b4\u03b7\u03c2<\/strong>\",\"image_align\":\"left\",\"image_margin\":\"xsmall\",\"margin_bottom\":\"remove\",\"text_align\":\"center\",\"title_color\":\"secondary\",\"title_element\":\"h4\"}},{\"type\":\"headline\",\"props\":{\"class\":\"uk-text-white\",\"content\":\"\u039c\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03b1 \u039a\u03bb\u03b1\u03c1\u03af\u03bd\u03bf\u03c5\",\"css\":\".el-element{\\n    text-shadow: 6px 8px 0px rgba(0, 0, 0, .05);\\n}\",\"image_align\":\"left\",\"image_margin\":\"xsmall\",\"margin_top\":\"remove\",\"text_align\":\"center\",\"title_element\":\"h2\",\"title_style\":\"heading-medium\"}},{\"type\":\"text\",\"props\":{\"block_align\":\"center\",\"column_breakpoint\":\"m\",\"content\":\"\n\n<p>\u03a0\u03c1\u03bf\u03c3\u03c6\u03ad\u03c1\u03c9 <strong data-start=\\\"1483\\\" data-end=\\\"1513\\\">\u03bc\u03b1\u03b8\u03ae\u03bc\u03b1\u03c4\u03b1 \u03ba\u03bb\u03b1\u03c1\u03af\u03bd\u03bf\u03c5 online<\/strong>, \u03c0\u03c1\u03bf\u03c3\u03b1\u03c1\u03bc\u03bf\u03c3\u03bc\u03ad\u03bd\u03b1 \u03c3\u03c4\u03b9\u03c2 \u03b1\u03bd\u03ac\u03b3\u03ba\u03b5\u03c2 \u03ba\u03ac\u03b8\u03b5 \u03bc\u03b1\u03b8\u03b7\u03c4\u03ae, \u03b1\u03bd\u03b5\u03be\u03b1\u03c1\u03c4\u03ae\u03c4\u03c9\u03c2 \u03b7\u03bb\u03b9\u03ba\u03af\u03b1\u03c2 \u03ae \u03b5\u03c0\u03b9\u03c0\u03ad\u03b4\u03bf\u03c5.<\/p>\n\n\",\"css\":\".el-element{\\n    font-size: 24px;\\n    font-weight: 800;\\n}\",\"margin_bottom\":\"default\",\"margin_top\":\"default\",\"maxwidth\":\"2xlarge\",\"text_align\":\"center\",\"text_color\":\"primary\"}},{\"type\":\"button\",\"props\":{\"grid_column_gap\":\"small\",\"grid_row_gap\":\"small\",\"margin_bottom\":\"default\",\"margin_top\":\"medium\",\"text_align\":\"center\"},\"children\":[{\"type\":\"button_item\",\"props\":{\"button_style\":\"default\",\"content\":\"\u039e\u03b5\u03ba\u03b9\u03bd\u03ae\u03c3\u03c4\u03b5 \u03c4\u03bf \u03c0\u03c1\u03ce\u03c4\u03bf \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1 \u03c4\u03ce\u03c1\u03b1\",\"dialog_layout\":\"modal\",\"dialog_offcanvas_flip\":true,\"icon_align\":\"left\",\"link\":\"\/book\"}}]},{\"type\":\"panel-slider\",\"props\":{\"content_column_breakpoint\":\"m\",\"content_margin\":\"small\",\"css\":\".el-meta{\\n    font-size: 14px;\\n    font-weight: 800;\\n    float: left;\\n}\\n.el-meta i{\\n    margin-right: 5px;\\n}\\n.el-link{\\n    float: right;\\n    text-transform: lowercase;\\n    color: #FFF !important;\\n    background: var(--wg-color-accent);\\n}\\n.el-link:hover{\\n    background-color: var(--wg-color-primary);\\n    border-color: var(--wg-color-primary);\\n}\\n@media screen and (max-width: 680px){\\n .el-meta, .el-link{\\n     float: none;\\n }   \\n}\",\"image_align\":\"top\",\"image_grid_breakpoint\":\"m\",\"image_grid_width\":\"1-2\",\"image_height\":440,\"image_svg_color\":\"emphasis\",\"image_width\":770,\"link_style\":\"default\",\"link_text\":\"\u039a\u03bb\u03b5\u03af\u03c3\u03c4\u03b5 \u03ce\u03c1\u03b1\",\"margin_bottom\":\"default\",\"margin_top\":\"medium\",\"meta_align\":\"below-content\",\"meta_color\":\"primary\",\"meta_element\":\"div\",\"meta_style\":\"\",\"nav\":\"\",\"nav_align\":\"center\",\"nav_breakpoint\":\"s\",\"panel_image_no_padding\":true,\"panel_link\":true,\"panel_match\":true,\"panel_padding\":\"default\",\"panel_style\":\"card-default\",\"show_content\":true,\"show_hover_image\":true,\"show_hover_video\":true,\"show_image\":true,\"show_link\":true,\"show_meta\":true,\"show_title\":true,\"show_video\":true,\"slidenav\":\"outside\",\"slidenav_breakpoint\":\"l\",\"slidenav_margin\":\"medium\",\"slidenav_outside_breakpoint\":\"l\",\"slider_autoplay_pause\":true,\"slider_gap\":\"default\",\"slider_width\":\"fixed\",\"slider_width_default\":\"1-1\",\"slider_width_medium\":\"1-2\",\"text_align\":\"center\",\"title_align\":\"top\",\"title_element\":\"h3\",\"title_grid_breakpoint\":\"m\",\"title_grid_width\":\"1-2\",\"title_hover_style\":\"reset\"},\"children\":[{\"type\":\"panel-slider_item\",\"props\":{\"content\":\"\n\n<div class=\\\"flex flex-col text-sm pb-25\\\">\\n\n\n<article class=\\\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\\\" dir=\\\"auto\\\" data-turn-id=\\\"request-WEB:18b16b9c-312c-4e59-b7c8-e63619b58da0-8\\\" data-testid=\\\"conversation-turn-16\\\" data-scroll-anchor=\\\"true\\\" data-turn=\\\"assistant\\\" tabindex=\\\"-1\\\">\\n\n\n<div class=\\\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\\\">\\n\n\n<div class=\\\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\\\" tabindex=\\\"-1\\\">\\n\n\n<div class=\\\"flex max-w-full flex-col grow\\\">\\n\n\n<div data-message-author-role=\\\"assistant\\\" data-message-id=\\\"f20efcd6-4503-4e10-aa9a-b7c2edc1036d\\\" dir=\\\"auto\\\" data-message-model-slug=\\\"gpt-5-2-thinking\\\" class=\\\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+&amp;]:mt-1\\\">\\n\n\n<div class=\\\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\\\">\\n\n\n<div class=\\\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\\\">\\n\n\n<p data-start=\\\"0\\\" data-end=\\\"22\\\" data-is-last-node=\\\"\\\" data-is-only-node=\\\"\\\"><strong data-start=\\\"0\\\" data-end=\\\"22\\\" data-is-last-node=\\\"\\\" data-is-only-node=\\\"\\\">\u039c\u03ac\u03b8\u03b7\u03bc\u03b1 \u03b3\u03b9\u03b1 \u03b5\u03c6\u03ae\u03b2\u03bf\u03c5\u03c2<\/strong><\/p>\n\n\\n<\/div>\n\n\\n<\/div>\n\n\\n<\/div>\n\n\\n<\/div>\n\n\\n\n\n<div class=\\\"z-0 flex min-h-[46px] justify-start\\\"><\/div>\n\n\\n\n\n<div class=\\\"mt-3 w-full empty:hidden\\\">\\n\n\n<div class=\\\"text-center\\\"><\/div>\n\n\\n<\/div>\n\n\\n<\/div>\n\n\\n<\/div>\n\n\\n<\/article>\n\n\\n<\/div>\n\n\\n\n\n<div aria-hidden=\\\"true\\\" data-edge=\\\"true\\\" class=\\\"pointer-events-none h-px w-px absolute bottom-0\\\"><\/div>\n\n\",\"image\":\"wp-content\/uploads\/2026\/02\/ChatGPT-Image-26-feb.-2026-11_53_19.png\",\"link\":\"\/book\/\",\"meta\":\"<i uk-icon=\\\"calendar\\\" class=\\\"uk-text-secondary\\\"><\/i>\u03a4\u03bf \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1 \u03b5\u03af\u03bd\u03b1\u03b9 50 \u03bb\u03b5\u03c0\u03c4\u03ac. <br \/><i uk-icon=\\\"icon:money\\\" class=\\\"uk-text-secondary\\\"><\/i> 35 \u03b5\u03c5\u03c1\u03ce \u03b1\u03bd\u03ac \u03bc\u03ac\u03b8\u03b7\u03bc\u03b1\",\"title\":\"<span 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