Total beginner, advice on how to top up bitcoin wallet ????

As the title states I am a total beginner and don’t know the first thing about bitcoin or wallets.

I have no intention right now of investing. I simply wish to make a purchase online with bitcoin. So far I have signed up to crypto.com and funded my account with regular cash. There is an option to buy bitcoin but I don’t know if that is to invest/trade or for me to spend on purchases. This alone has me worried about hitting buy lol.

I believe I also need a bitcoin wallet in order to make payments for goods. How do I get a wallet that is compatible with crypto.com app.

I have tried researching myself but I just get more confused doing so ????

Please help guys ????