If you have some extra fun money, it could be entertaining to buy some stock and follow it.
However, very few people can beat the market by picking stocks. Some people get lucky.
It is a good idea to begin investing as soon as you can -- look into buying passive index funds -- historically they deliver reliable, long-term returns around 8-10% annually, even more than most actively managed funds.
(However before that make sure you have fully funded your Roth IRA -- it gives you a big tax advantage over time.)
For years I have been on a forum similar to this one; it has a funny name but a lot of smart people. They are investors who follow the investment philosophy started by John Bogle, the founder of Vanguard -- they call themselves the Bogleheads.
Often when I want to explore an investment question, I go to a search engine and type "Bogleheads"-- and then my search term to find what they are saying on the forum.
I also like Investopedia and the White Coat Investor.
Here are some links describing index investing -- more rabbit holes to go down ;-) for those interested --
A blog post --
https://www.bogleheads.org/blog/2014/09/17/why-index/
Wondering why you're no good at stock picking? The odds are stacked dramatically against you. Do yourself a favor and don't play this loser's game.
www.whitecoatinvestor.com
Most of my portfolio is invested in index funds. I hope that's not news to you. Here are 10 of the reasons why.
www.whitecoatinvestor.com
A sample post on the Bogleheads forum --
https://www.bogleheads.org/forum/viewtopic.php?t=461242
Index investing has been around for a long time and remains a valid investment strategy. Fundamental investment principles tend to stay consistent, unless you want to explore investing in crypto -- that's a newer, whole different subject...