Apart from The Net Ninja and Traversy Media, I can't really cite any resources that I'd use regularly.
Specifically for the MERN stack though, I can recommend the Full Stack Course from Helsinki University. But the learning curve is steep to say the least, I often get stuck and have to do additional research.
I've also bought the most recent Udemy MERN course from Brad Traversy, but realised I couldn't keep up with the pace - which was the initial motivation for this blog. I think I'm almost ready now to go back to it, though.
And I'd love to read about how others tackle this challenge!