Some of the ways I have learned is through losses, like most. Failure is often a huge lesson. I tend to think about what's going on on the world, and how that can impact various stocks. But that alone, won't always work. Its important to know what you hold. Follow the stocks, and keep up to date on what they're doing. I'm still a work in progress, but learning to read charts is vital. Where has it been, where is it going? What's the projected price? What do more experienced investors say? I guess, like anything else, question everything and then question some more.

While I am a "don't invest what you can't afford to lose" type, I get why some people may take a different approach. Especially, the younger generations. I mean, look around. The world is going to 💩, we likely won't have social security to retire on, many are barely making ends meet. I understand why people would take a chance like that. Gonna work your ass off, and be in debt anyway? Might as well take a chance. 🤷
I do encourage each person to do their own DD, and maybe take a look at long term investments you can stick a bit of each pay in to grow over time.
But however you invest, I hope it works out for you. And I hope we can all get through all the BS and see better days come our way.
Stay strong. Stay well. Stay safe. ...

And of course, I had to sell last week. Definitely getting in next chance I get. Grow baby, grow!