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Thank you for the link! I didn't know about beginner friendly game jams so I'll definitely check this out :) 

Your point about being frustrated with unfamiliar tasks was precisely what I've been hesitant about when thinking about participating. In any case I'll make sure to check out My First Game Jam! Thank you once again.

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You're welcome.  If you don't want to attempt a jam right now, I would still suggest trying to make a small game, like a basic jumping platformer or an arcade clone.  You will probably stumble and have to look up how to do some things, but that's the only way to learn.  Don't worry too much about making mistakes or writing bad code.  When you're done, you'll learn from those mistakes and do better next time.

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 Participating in game jam also helps you to learn fast decision making. When jam is about to end and your game is 80% complete, you have to make quick decision to ensure your submitted game is complete.

So my suggestion if you're not sure about joining game jam yet, is to join game jams with long duration: one week for shortest and one month for decent time. Make sure your game is COMPLETE before submitting. This small suggestion should be enough for you :).