Nothing is more important when it comes to the content quality of an e-learning platform.
Let me talk about the projects first.
As I told you, Udacity is more project-centric.
That means you learn by doing here.
These are the real-world projects aimed at providing you with practical experience.
All your projects are reviewed by a mentor who guides you throughout your nanodegree.
As these projects are valuable, you can add them to your resume or LinkedIn profile to lure employers.
Also, the instructors are industry professionals, good at teaching,
Many of them come from notable organizations like Google.
Even the founder of Udacity, Sebastian Thrun, himself is a Stanford professor and founder of Google-X.