If you want to remove an attribute's value in Okta, for example a value coming from AD that is not useful in any way, you have to:
Solution: Delete the mapping by the help of which the value came into Okta User Profile

When you call a GET API call for users / groups / and other such objects, the response is usually Paginated, in case these are a lot of objects returned. What do you do in order to retrieve all objects?
Solution: You call the very same API with the help of a different token, hence will return the next page of objects

The Okta On-Prem MFA Agent acts as a Radius client and communicates with the RADIUS enabled On-Prem server, including RSA Authentication manager for RSA SecurIDs. This basically allows your organization to leverage Second Factor from a variety of On-Premises multifactor authentication tools.
Solution: The statement is true

After you turn on Desktop SSO, a default DSSO related routing rule is created. You must configure the network information for this rule.
Solution: You have nothing to do and even the rule is by default set to "Active"

When you call a GET API call for users / groups / and other such objects, the response is usually Paginated, in case these are a lot of objects returned. What do you do in order to retrieve all objects?
Solution: You have to call a different API request for the next page, which will then provide another API call in the response headers of it - for the following page (in case there are still objects to be returned), till there are no more objects to be returned