What's the best way to land on the Mun with all vanilla equipment?
Basic 3 stage build:
Lander should be your normal, asas and rcs help a ton, choice of booster is up to you here, either the super small variety or the vectoring engine, I usually use vectoring. Then make the landing struts out and down, or something logical.
Orbital/Mun descent slow-down stage should be simple, 4-6 liquid fuel tanks and a vectoring engine.
Symmetry to 6, radial decouplers, 3 liquid fuel tanks and some powerful engines.
Now whether or not you want the vectoring engine to fire at the same time as the powerful ones it up to you.
I usually just keep them separate though, however, it gets a bit difficult to turn around 30,000m.