Very basic -- and if Albedo was concerned enough about that very basic to be applying to strangers in the Institute to improve it, Sasuke could probably safely assume the emphasis was more on very than basic. Fortunately, although Sasuke had no illusions about his own qualifications as a particularly tender teacher, he had a precise enough memory to know how he himself had been taught.

Raised to work in teams divided by efficacy, Sasuke didn't think to question what precisely his roommate meant by unit: of more interest was the term firearms, still new and somewhat unclear to him, and the idea of weaponry that was alternate to those. That was perhaps a line of inquiry worth pursuing in time.

"I assume that what training that he has had has been defensive in nature?" That hopefully meant that this as-yet unknown brother knew how to take a fall. Any talent or skill beyond that were things Sasuke would need to learn through his own observation.