Halvtand said
Basic stuff would be pretty much everything from the names of the characters (and their signature moves) all the way up to common knowledge about much used techniques. (how to learn the rasengan, who invented chidori, general info about sharingan...)
Gotcha. Well...if you are in a Naruto RP, you would hopefully know that stuff. It's basic. I can understand someone new to the fandom having some trouble, but...yeah.
Edit: Here is my 'head-canon' for Genjutsu and you can tell me what you think. Genjutsu as used by regular shinobi is used by advanced control of one's chakra. This advanced control allows the user to 'feel' their weaves of chakra and uses it to mesh into another shinobi's chakra which then creates the illusion. A regular shinobi can realize this by either observation of a change in the world or for those intimately familar with their own chakra...sense the foreign chakra messing with their senses. They can then combat this in the way stated in canon.
For dojutsu like the Byakugan and Sharingan however, they can see rather than feel the chakra weaves. This allows them to notice the strands trying to integrate into their own chakra and they can then combat the genjutsu by either what was stated; or in the case of a genjutsu user, they can wield their own strands to cut/combat their opponents. So kinda in my mind during the Itachi-Sasuke fight, they were standing still but a brilliant tapestry of chakra was being weaved throughout that room.
It's not really ever explained in canon, but sense Naruto is not a genjutsu user; Kishimoto never really had to explain the science behind it.
Edit2: I agree with ya Mad. Just there has always been controversy on some conflicting things. For example in the wave arc the only definition given is that the sharingan can copy jutsu. So people took that to mean if you see it, you can copy it. Doesn't help that Kakashi (who has plot-armor/genius) did it a few moments later against Zabuza.