Hello, I am a newbie. Which topic should I read fist? Thank you.
Welcome to envato market,
You can read this:
As we know there is no limit to gather knowledge. So we can read all kind of resource we get in this market. But if you are author and want to submit Item you can read this: https://help.author.envato.com/hc/en-us/articles/360000470786-Common-Rejection-Reasons-for-Envato-Market
You can study here also: https://code.tutsplus.com/