I will advise you take your time to study about all the mentioned wallet by members here as it would help you make a good decision when choosing which to stick to. Wallet are integral part of crypto because without a wallet you can not keep your assets and that is why you will have to know more about wallets and make a sound decision on the particular wallet to choose.

Lastly, you don't use wallet to invest in Bitcoin but rather you store or keep your bicoin in wallet. Wallets are just like houses where humans live in.  So your Bitcoin is stored or kept in your wallet where only you can access through your private key which you must keep safe and handle it with care otherwise if anyone gets hold or knowledge of it, your assets are all gone.