Using Canvas REST APIs how do I get a list of grading columns OR all gradable entities in a given course?
Also which API do I use to get a list grades for a given course?
I have had a look around the community and found a few resources that should get you started:
That should get you started with your first question. With regards to listing grades for a course (i.e. total grade), you would need to use the Enrolments API which is documented Enrollments - Canvas LMS REST API Documentation (the total grade is calculated and returned against the enrolment in a particular course.
Hope that helps!
Retrieving data ...