Where flexbox and grid layout in the CSS-Course??

Question

Flexbox and grid layout it's very needful things

Answer 1

Courses here doesn't claim to be complete, but are intented to introduce beginners...
Anyway, no css course could pretend to be complete, as any living standard ^^

Answer 2

grid layout is not widely supported actually ^^ (support depend of browser/version used, and specifically in sololearn app, require to have android webview version supporting it to work)
https://caniuse.com/#feat=css-grid

Answer 3

but without this CSS-course is incomplete