Its a shame I feel like he just left out the most important part of this whole thing.
For the frontend part, you have to take a frontend course. Mosh has two frontend courses that I know of - React and Angular.
The Angular course is grossly outdated, thanks to Google for making breaking changes every 6 months or so. The React course is outdated but you can still get it to work after 3 or 4 years.
Whichever one you’re buying, just see his YouTube crash-course video just to be a bit confident about the buy you’re making. I prefer a slightly outdated Mosh course over other 30 hr boring courses.