I have some experience with Unity (not much because I never released a game, just prototypes) so I have some experience with game dev, but the think is that I really wanted to use Godot because of everything that happened to Unity, but I really don't know where to start.

I would recommend this: https://school.gdquest.com/products/learn_to_code_with_godot_3

it’s for Godot 3 and not Godot 4, but your knowledge of the engine should transfer over to Godot 4 when you’re ready to use that

If this is your first jam using Godot (will be my 3rd, not that far) and you feel going rogue uneasy, I recommend you pick any YouTube tutorial that you find cool and give it your own twist with art, balance, content, etc.

Example: