Learn by doing. I started with a couple hundred dollars and just immersed myself. I learned a ton and made a few mistakes, but IMO it is probably the best way to get a feel for the market.
You could also try
https://testnet.bitmex.com/ if you want to do some leveraged trading without any risk. Trading a margin is definitely something I wouldn't just jump right into with real money.
We can also learn by reading threads about the Market. There are threads here in the forum that we may read for us to learn. Many people are sharing their knowledge about a certain Market which we can adopt and learn.