I got stuck with a bunch of NNOX stock lately and still have some NKLA (Nikola Motors) stock from a while ago. Otherwise, my system can be pretty profitable. Go, Green New Deal!
The biggest mistake is not being in touch with reality. Trading successfully takes the equivalent of a college education to learn and then it's still tough to make it.
Barchart is affordable, gives me charts and screeners and watchlists, I've used Barchart off and on since 2005, it feels natural to me, it did take me a lot of research and tinkering and strategizing.
I get paid for estimating volatility. I'd rather estimate high volatility from a high volatility stock and get it than estimate low volatility from a low volatility stock and not get it.