Meaning of “basic” - Learner’s Dictionary

basic

adjective uk us /ˈbeɪsɪk/
MAIN [ always before noun ]

B1 being the main or most important part of something:

The basic problem is very simple.
NECESSARY

B1 including or providing only the things that are most necessary:

SIMPLE

B1 very simple, with nothing special added:

My software is pretty basic.

(Definition of “basic” from the Cambridge Learner’s Dictionary © Cambridge University Press)