Html, css and JavaScript,ok . But when a official theme development tutorial?
What exactly are you looking for, apart from the documentation?
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Here’s an official tutorial about themes that might help prepare you before you delve into the docs: Essential concepts to know when building a Ghost theme
Lots of people have made their own tutorials over the years which are equally valid if you’re looking for tips to get you started, but the docs Jannis shared are the most important resource.
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