That's one of them subquestions ;-)
My advice would be, look at the games you like and what tools they used, as some give that information in their profile or in the more information box of the games. And then start from there with the usual internet searching. Or even the forum here. There is also an asset category besides the games category on itch. And you can be sure there is a ton of tutorials on youtube, if you wanna do it yourself.