Although it is not really important to learn MongoDB to start using it in Nest applications, it would always help to know more about it to get a bigger picture.

If you feel the need of the same, you can take a break from here, and check out the APPENDIX-A where I have added videos from another of my course "Mongodb fundamentals". Once you finish all of them, you may resume this course.

As always, wish you a happy learning,

Vinod.