What to use to create a private/public key for Bitcoin?

[MarkRoberts]

The secure way to proceed is:

Buy Bitcoin from Exchange

Download secure wallet app like Blue Wallet yo your phone

Take note of your new wallet’s 24-word recovery seed and keep it somewhere secure where it won’t be damaged or lost.

Send your BTC from the Exchange to your Blue Wallet’s receiving address

Learn about, and then consider a hardware wallet like ColdCard.

DO NOT use online tools to create public/private keys.