If you are wondering which Bitcoin to invest in, you will be happy to know that there is really only one option. Bitcoin is the only Bitcoin, and the other two tokens that share Bitcoin's name aren't actually Bitcoin. In addition to Bitcoin Cash and Bitcoin SV, there are thousands of other tokens that you could choose to buy.
So, just to be clear, the choice of which Bitcoin to buy is very simple, you should buy Bitcoin, that trades under the symbol BTC. Bitcoin Cash and Bitcoin SV are much later additions to the world of crypto, and while they did start on the Bitcoin blockchain, they aren't Bitcoin.
If you want to invest in something besides Bitcoin, you could consider Ethereum and Ripple. Both of these tokens are popular, although Ethereum seems to be getting more attention from investors in the post crypto bear market recovery.
There are many ways to buy Bitcoin, and you may be able to use your bank account to fund an account at an exchange. Be sure to do some research on the exchange or buying platform before you send them your money, or supply them with credit card information. Buying Bitcoin is easy most places in the world, and it is becoming more popular all the time.