Deep linking describes a link that points to a lower level page of a website. e.g. instead of linking to the top level page at https://example.com, the link may point directly to https://example.com/foo/bar/
Transferring your domains between registrars can help consolidate all domains into one account. Registrars charge different renewal rates so it may be cheaper to move.
.com and .net
You will have to request the ‘auth code’ from your original registrar before starting the process.
This is triggered from the original registrar. You should be able to tell them the new IPS Tag of your target registrar.