I'm just getting started, so I still have yet to make any sort of mistake. I'm hoping that I never do, but chances are I'm going to end up screwing myself over one way or another.
Would it be worth it to avoid investments for the first while and watch to see which ones turn out to be scams, fraud or whatever?
You wont learn by just watching, you gotta experience it.
Invest in stuff but go in small, if you think you can afford losing $5 in a coin that seems interesting and might get you $150 reward - do it. But don't invest $100 until you know your stuff!