Can anyone please explain it in a better way?

Question

I'm unable to understand most of the part.
Especially drawing the shape of line and rectangle......
https://www.sololearn.com/learn/HTML/2200/

Answer 1

Try W3schools - it may help
SVG tutorial:
https://www.w3schools.com/graphics/svg_intro.asp
Also for triangle (polygon):
https://www.w3schools.com/graphics/svg_polygon.asp

Answer 2

Try checking it up at the w3 school