If you want to learn and do some day trading to learn you could start with apps like Robinhood. They should allow you to set buy and sell orders so that way you are able to be comfortable with a low point to buy and a high point to sell. Do not get into shorting stocks until you have some experience under your belt.
Just go with small amounts and only in an amount you are comfortable with losing if an investment goes wrong. It can happen and does from time to time. As mentioned in previous post playing it safe at first is a very good idea. Returns are smaller, but they usually stay consistent and manageable.
Higher risk investments, for example penny stocks, come with potentially high returns, but also the potential to tank. However, if you time it right and find the right investment you could set yourself up for a financial windfall.
Take for example the guy who bought into the crypto Shiba Inu Coin last August when it first came out. He invested $8,000 when the coin was around .00000000010 of a cent. His investment at Shib's high point a few weeks ago of .000085 was worth a staggering $6 Billion. He could have lost it all, but he took a risk and with it came the reward. However, this is the exception so be aware of this and don't invest unless you are prepared to lose money as well as make money.
Not trying to scare you, but just pointing out the facts of what can happen and does happen.