Router Bits, which ones do I need

Exactly as the topic states. What are the top 3-5 router bits (or more) that one would suggest buying that are necessities to a build? I have used a lot of different tools, but never a router, so I am still working out upcut, downcut, top or bottom bearing etc.... We will be using a harbor freight plunge router as it look like a descent router for the money.
ALSO, what is the preferred manufacturer for router bits. It there a middle of the road and a top of the line manufacturer that I should look for? I'm assuming all router bits aren't created equal as far as that goes.
I know from looking though dozens of build journals, that the router is extremely important for all sorts of cutouts, templates, doors, etc, so I want to make an informed purchase before I go out and break the bank on a bunch of bit we won't use.
Thanks, as always, for the input.
ALSO, what is the preferred manufacturer for router bits. It there a middle of the road and a top of the line manufacturer that I should look for? I'm assuming all router bits aren't created equal as far as that goes.
I know from looking though dozens of build journals, that the router is extremely important for all sorts of cutouts, templates, doors, etc, so I want to make an informed purchase before I go out and break the bank on a bunch of bit we won't use.
Thanks, as always, for the input.