I made lots of mistakes early but got better over time.
Two main lessons I would point out are it takes a few years to play out normally and the main danger is going too early. Learn that things can fall 50% lower at least then you could ever think was possible. Can easily drop 50% a few times. Current LTR investors are learning this right now and plenty of minnow lithium stocks have learnt it more harshly. The falls go on.
Skill number two is too wait for a 90% drop minimum before you play. This saves you a lot of time not analysing a big number of stories. More importantly the ratios are now strongly leveraged in your favour. TTT fell 99% is probably as good an example as you will see. The huge fall, and the good reasons found for a possible recovery, which are yet to full play out. Not being fully played out means they could also go sour yet. Getting free carried a breeze on this ratio.
Wisdom - you need certain research skills to play this game. If you don't have them don't play it until you do.