I would advice you to learn about what digital currencies are first. I like the videos of Andreas M. Antonopoulos a lot. Watch his ones first, since he is not trying to sell you anything as far as I have seen.
Then find out what exchange would work best for your situation. You need to be able to deposit and withdraw your fiat currency, as well as to trade the coins you want to trade.
See if you like the interface, speed of trading etc.
Then take a small amount of cash and buy your first coins. Take only money you do not need, and are happy to loose. Like $100 or so.
Use that to try out a transfer to your own wallet and trade a bit.
You will learn that it is not so easy and that there are costs in trading and transfers.
Once you have fiddled around a few days or weeks you could start to put in some more money to try again, or start investing for real. Once more, dont use any money you borrowed or need. Chances are that when you realy need your money, it will probably be the worst time to sell....
I advice to diversify your investments. Crypto currencies being only a small percentage, and consider it the most risky one.
The more risk, the bigger your loss or return.
Sometimes having some boaring investment that is giving you a small but steady return is also nice to have.
Try to make a plan on when to invest and when to cash out.
Start small and keep on learning for ever.
All the best.