Just pick one here is your going for long term investment and for a more secure wallet. You could pick standard wallets, seeds, private keys, etc. for example in electrum.

Go for a custodial wallet like coinbase if you're not planning for a  long term investment you might encounter a problem here but it is more reliable when your planning to withdraw your investment, also it is easier to use and set up than other wallets you just need to create an account in the website and probably do a KYC.