The biggest mistake I have ever had is when I engaged in crypto mining. I did not listen to some people that crypto mining is already did. I didn't generate any profit because I have a not so good rig for mining and the electricity it generated was expensive than my profit. I only mined a few in a span of a month and really got nothing in return. But at least I got an experience on how mining works. I still got something valuable which is a lesson that won't be stolen for me. I guess listening to some forums and guide is a good idea.