The curriculum will teach you a lot about websites, as it takes you through the full stack. Honestly, since I learnt React, I hardly ever use the DOM methods directly.
The main DOM manipulation content is taught in the jQuery section.
Hope this helps
So if I understand, it is more common to use a front end library to modify the webpage content, so that is what the course teaches?
That makes sense, I just want to be sure I understand!
It is definitely more common to use a front-end library for this. You will still use the odd method here and there, if you do enough web-development, and I encourage you to do your own research into DOM manipulation.