Last year's jam was my first ever jam, and although I almost missed it, I wanted to join again.
I'll admit I've not made as much progress in learning gamedev as I'd like, but I'm still enjoying the learning curve.
My 2 favourite bits of any jam are the theme restrictions and the community. Pretty much every jam I have done has been welcoming and getting the opportunity for feedback is always a great help.
So good luck to everyone and I hope you enjoy the experience.