But I don't know about wallets. I don't know how to use wallets properly. Which wallet should I use to invest in Bitcoin? And what should I do?

I want to know about wallets.
You don’t use a wallet to invest in Bitcoin; you use a wallet to store and safeguardyour Bitcoin, and the best wallet you can use and that’s recommended is an open-source wallet. You can go for
electrum wallet,
BlueWallet Electrum Wallet or BlueWallet, which are both mobile-friendly wallets and easy to use.
Thank you for sharing this, I am just getting to know about Electrum and blue wallet. I will get those. I focused on bybit and trust wallet.
Trust wallet is not much trusted as an open source wallet, so having your bitcoin investment saved there pose a lot of risk. You can check on Electrum which is kinda not too mobile friendly but an open source with good reputation to save your funds in, available in android and not on IOS devices on mobiles. Blue wallet is more of mobile friendly and I will recommend using it if you don’t have a desktop to download one and save it in.
Bybit is an exchange and pose the highest risk of leaving your funds in, you can only use it to buy bitcoin and send out to your personal wallets. Other uses of the exchange it to trade crypto in if you’re a trader or use to swap from one token to another (as in token convert and p2p services). It is not recommended you leave your funds there for long if you’re not using it for any of the above listed.