Relation between Faculty, Student and Course tables
One Course can have many Sections.  "One-to-many".  That is handled via a course_id column in the Sections table.

Many Students take many Courses.  "Many-to-many".  That is handled by a many:many table with two columns: course_id and section_id.  Note that you can find the course_id from the Sections table.

Facilty:Sections is also many:many.

I don't know where you are going with "OneToOneField".  Generally it is not good to have two tables in a one-to-one relationship.

Students and Facilty, though both humans (I guess), do not seem to be related at all.  Well, maybe you have "student teachers"?