Hello it is my first jam can you share your knowledge and experiences with me?

Do your best and . . .

Have fun (most important)

(and learn)

Make a simple and small game. Also only do things that are important and the extra stuff if you have time left

Have fun and don't overdo it do something you can do it's hard to limit your imagination you may think of great idea to add to your game but make sure to stick to your plan make sure to do the things you can do in a limited time

Don't get stuck in your first idea, your second, third, and next ideas are more interesting,

Always iterate on your ideas.

Also it is okay to cut down your ideas into the smallest, doable game :)

I'd say try to make the game's difficulty easy. Since you're going to play the game more than anyone else, you'll probably be the best player, so if the difficulty is really easy for you while playing, it will probably be a normal difficulty for the new players. This comes from personal experience, almost all my games are really hard because I didn't take that into account while playtesting, and it becomes frustrating for the players.