adjective
elementary
el-ih-MEN-tree/ˌelɪˈmentri/
Concerned with the simplest, most basic stages of a subject.
A pupil uses counting blocks to learn elementary addition.

Etymology
Elementum could mean a rudiment or first principle, making “elementary” applicable to the basics of a subject. That sense developed into “simple” and underlies elementary schooling, where those basics are taught.
In context
in first grade you're wearing that shirt yeah this is like what elementary school boys wear now I guess
More examples
- The course introduces elementary concepts in computer programming.
- She teaches third grade at the local elementary school.
- You need only an elementary understanding of fractions to follow along.
Forms
elementary
Similar words
- basic
- Emphasizes essential ideas without necessarily suggesting an early learning stage.
- introductory
- Specifically describes material intended for someone beginning a subject.
- rudimentary
- Often suggests knowledge or skills that remain minimally developed.