Manual Sharing is used to grant one-off access. Manual sharing can be granted by the record owner, anyone above the owner in role hierarchy and System Administrator. Manual sharing is used to handle exception cases where access to a particular record needs to be given to a specific user. There is a Sharing button on the records page. This is used to provide manual sharing.

False => https://help.salesforce.com/s/articleView?id=sf.granting_access_to_records.htm&type=5 Sometimes, granting access to one record includes access to all its associated records. For example, if you grant another user access to an account, the user automatically has access to all the opportunities and cases associated with that account. To grant access to a record, you must be one of the following users. The record owner A user in a role above the owner in the hierarchy (if your organization’s sharing settings control access through hierarchies) Any user granted Full Access to the record An administrator

Answer is correct. Manage User permission is required to enable. https://help.salesforce.com/articleView?id=sf.security_sharing_owd_user_manual.htm&type=5

Users are can share records with groups, territories, roles ... But the ability to do this needs to be set up by the administrator. https://help.salesforce.com/articleView?id=users_sharing.htm&type=5

Answer is False

Checkout q#37: Who can manually share records?

Ans is true; Users CAN grant access if they own the record