Youtube is a good place to start, there's a ton of tutorial videos on the S21U on there; I spent hours on there familiarising myself with the phone.
Have a read through the Samsung Members app forum too, there's a wealth of experienced users on here who have posted just about everything on the phone.
If you find something you're not sure of, you can also ask Samsung Help directly through an option on the Members app.
I'd recommend installing the Good Guardians app from the Galaxy Store, and it's attachments like the App Booster.
Regularly check you have the latest updates for apps installed too.
In the Biometrics and Security tab, check the 'More Biometrics Settings' tab too, for the latest Security Patches.
Have a read through the Samsung Members app forum too, there's a wealth of experienced users on here who have posted just about everything on the phone.
If you find something you're not sure of, you can also ask Samsung Help directly through an option on the Members app.
I'd recommend installing the Good Guardians app from the Galaxy Store, and it's attachments like the App Booster.
Regularly check you have the latest updates for apps installed too.
In the Biometrics and Security tab, check the 'More Biometrics Settings' tab too, for the latest Security Patches.
