two factor authentications

See the following from Two-factor authentication for Apple ID - Apple Support

If you already use two-factor authentication, you can no longer turn it off. Certain features in the latest versions of iOS and macOS require this extra level of security, which is designed to protect your information. If you recently updated your account, you can unenroll within two weeks of enrollment. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require higher security.

Unless you are doing something strange, 2 Factor Authentication is mostly transparent in every day use.

You should not encounter it at all unless you are logging in to a new device for the first time, or logging into an Apple service like icloud.com or tv.apple.com for the first time.

After that, the web browser can be trusted to no longer require a code to log in, and the new device becomes a trusted device so no longer needs a code for anything.