Basics would be anything a new shooter needs to know. (zeroing a scope, breathing, follow through, trigger pull, etc.)
The reason I say a cheaper rifle is better to learn on, is that if you make a mistake that damages the rifle or optic, you didn't just ruin an expensive piece of kit.
I have seen guys not torque down a scope enough because they didn't know... the scope hit the floor and broke...
Also a decent .22 can teach you a lot about getting a good group with a couple hundred rounds, instead of say a .308. saving a couple hundred dollars to invest in a better rifle once they know what they are doing.
Like I said before, if someone who never shot before wants a PWG in .338, by all means buy it, but don't expect accuracy when they are jerking the trigger, hot breathing properly, and not consistently using a proper hold at $4.00 a round.