For Bitcoin investment you don't need to learn anything specially. You just need a strong Patience to keep your holding until you get your desire profit. But you need to know how to keep your Bitcoin secure because if you not keep your Bitcoin wallet key safely and if someone find your key then he can easily access your wallet without any authorisation or your permission. And then he can easily transfer your Bitcoin anywhere. And that's why you have to remember that not your key not your Bitcoin.

But if your intention to do trading then yes you have to learn deeply how to analysis the graph and the whole market. And this is very difficult for a new trader to achieve success. That's why I will suggest you don't go for trading just buy Bitcoin and hold for long term. and use a non-custodial wallet for holding like electrum or hardware wallet. so now just learn how to manage electrum and hardware wallet