New to Theme Development

Hey everyone!

First post on here. Looking for some advice! I’m a front end developer and would like to get into theme development. Specifically HTML for now. I’m OK at React but trying to keep things simple for now… That said, being new to the theming, I don’t want to put out out garbage and be rejected after putting in a lot of work (learned that the hard way as an AudioJungle author). What are some good resources you all use when developing a new template? This could be related to design, coding standards, file organisation or anything else relevant.