In my opinion, the best way to learn how to trade crypto is via a demo account. If you use a practise demo, you do not risk any money and you can learn a lot there, at least I did. Even tho the psyche is not the same as when you trade with real funds. You can also check out some guides like this one for beginners in cryptocurrencies which can help you get on the right path. But still, they are just guides, they can never match to what you can learn when you trade on your own.

My first ever bought coin was Bitcoin, followed by Ethereum. My current portfolio is however, now significantly more diversed