Hello, I have never done a game jam before and I have a couple of questions about posting our projects.

First off, once we post it, can we edit it?

Secondly, is it encouraged to post early builds of our games? Or is that discouraged because of idea stealing and such?

I just don't know how much time I'll actually be able to dedicate this and don't want to miss the deadline because I didn't have enough time. I want to get something out, even if it's bad. Also, on that note, mine is probably going to be very bad. I'm still very much a beginner and don't have the time or knowledge to make mine super good. 

Once posted you won’t be able to edit or do any changes to your game.

Yes, you can use builds, tools and assets from previous games or marketplaces.