Hello and welcome to the forums. I don’t want to seem like I’m discouraging interaction on the forum, but this question has been covered in many, many topics already.
The backend section seems shorter because the frontend lessons include basic JavaScript and other skills that apply to programming in general. Regardless of the section, understand that there will always be more to learn, so you’re never finished. If you can successfully complete all of the projects, you’ll have a great portfolio that will certainly be helpful in your job search. If you complete the non-profit work, you’ll have actual, professional coding experience on your resume.