How to create HTML site to EPiserver? how to implement all html code to episerver cmscontent area is there any approach?
https://world.episerver.com/documentation/developer-guides/CMS/ is your core place to learn how to build an episerver site. I'd recommend creating the Alloy demo and becoming familiar with it. There's also the option of paid online training as part of the academy https://www.episerver.com/education-store