This database design course will give you a deeper grasp of database design. Caleb Curry teaches the equivalent of an entire college course during this eight hour video.
Databases are a key part of most developer jobs and this course will help you understand the database concepts you need to know.
Learn more about this course by reading Caleb's blog post about the course.
You can watch the full video on the freeCodeCamp.org YouTube channel (8 hour watch).