I guess since you are a newbie, I would suggest to stick first with Binance so you dont have to worry about the gas fee. You can even fund Binance using your creditcard. Then later on you can start investing using your metamask or buy a Trezor wallet for added security.
are you giving op the platform to buy or you are informing op the exact wallet the bought can be served without hacked, because i really don't comprehend exactly your point. If actually it's a place were he can get or purchase a coin through all exchanges, i think you are right by recommending binance,but we have numerous exchange were purchasing of cryptocurrency can be done with much disturbance or trouble.