I learned when I am 16 I am never day trading (gambling). 401K and mutual funds only for me. There are too many people who find day trading either a hobby or a job, and it's not something I find that much interest. Lots of people spending a lot of time and money doing research, I'm not going to be the least informed in the room.
In my HS economics class for fun/extra credit we spent half the period once a week trading stocks. We were given $100,000 of imaginary money to invest how we want. Whoever had the most money at the end of the semester got some level of extra credit.
I was smart and though I should diversify, some in manufacturing, some ag, some products. I lost money continuously.
The people who barely graduated blindly invested in big name obvious stuff, Google, Coca Cola, Green Mountain Coffee, and made tons of money.