You are logged in to a "special profile." Windows blocks updates and upgrades ("deployment operations") when you are logged in to a special profile. The term "special profile" refers to roaming accounts, temporary accounts and guest accounts. That isn't the type of user account you should be using.
When Windows 10 sets itself up, after you press the Power button for the first time, it leaves you with a password-protected Administrator account. The Administrator account is not intended for regular, everyday computing. You sign in to the Administrator account only when you need to do something on the computer that requires elevated permissions like installing software, making substantial changes to the computer ... and setting up user accounts.
We're supposed to use the password-protected Administrator account that Windows 10 gives us to setup Standard user accounts for everyone who will be a regular user of the computer. This is a crucial safety measure that is too often forgotten.
If you don't recall setting up a Standard user account for yourself, you were probably still using that original Administrator account. From there you somehow managed to get into one of the special profiles, where something has gone very wrong that can't be fixed from the type of account you are using. And since you are aware that you are a novice, it's not a good idea to try to repair the damage on your own. You need to start all over. So here's what I think you should do:
1- If you have personal files that you don't want to lose, show the computer to a professional, who will save those files for you. Then you can start all over.
2- To start all over, use the computer manufacturer's procedure for resetting the computer to the way it was when it left the factory. You can find the procedure on the manufacturer's website and they will help you. This will erase everything now on the computer, and the computer will look and work exactly as it did after you pressed the Power button for the first time.