I don't understand a lick of how it works, but I've been planning on investing in some on Robinhood after the current spike settles down. I mainly target long-term high dividend, so they aren't really my style, but I'm thinking of starting small with Ripple, ETC, or even Doge.
For years I've thought of building a mining rig but I never really understood enough of how it worked to invest the time and money, plus youtube videos at the time would point out that unless you pay thousands for top of the line cards (and pay the ensuing California electric bills), it wasn't worth it. Of course this was back when bitcoin was around $500, so even a sliver then from a Pi 3+ and a $250 miner would be worth a profit now.