Courses required for implementing navigation on a multirotor drone

I just finished the ROS Basics in 5 days course and had a look at the next course in the learning path which was about URDF modeling. I went through the first two units. Here is the query:
My main aim is to implement a navigation system on a multirotor. Basically it should avoid obstacles while moving autonomously. Considering this aim and time constraints that I have, the URDF modeling course doesn’t seem like a necessity.
Can I get some advice on which courses I should complete first. Should I move directly to the navigation course or are the courses like TF in ROS, Robot Control important for my task?

I suggest these elementary courses:

  • TF ROS
  • Navigation in 5 days

After taking these courses, you can move to more advanced ones.

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