im talking ones like “vw” and i think also “vh”? the new html-css course never explained them not even slightly.
vw stands for viewport-width, and vh stands for viewport-height.
10vh means 10 percentage of the viewports height.
23vw means 23 percentage of the viewports width.
I looked up a documentation for you, this has an explanation of different units:
Im not sure whether the new course has explained them, but the old course had taught about
The explanation of these is there in the
relative length units section.