Do what in 2021?  Did you have a specific question?

My original post is very generic, depends what you're trying to do.  But what I posted is part of what I do in QB2021.  There are Vendor Invoice entries, Register entries as I mentioned before, Client Invoices you send out to get paid.  Lots of different parts to QBs.

If you are brand new to QBs, you might want to watch some of the may videos out there on how QBs works.  Then come back with specific questions that you're not sure about doing.  A "How To" manual is not really easy to do on this or any forum.