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”

“basic training for raw recruits”

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

Pertaining to or constituting a base or basis.

“a basic fact”

“the basic ingredients”

(usually in the plural) 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.