basic

reduced to the simplest and most significant form possible without loss of generality

“a basic story line”

serving as a base or starting point

“a basic course in Russian”

a necessary commodity for which demand is constant

a popular programming language that is relatively easy to learn; an acronym for beginner's all-purpose symbolic instruction code; no longer in general use

of or denoting or of the nature of or containing a base

pertaining to or constituting a base or basis

“a basic fact”