Teacher - courses

General information:
What is a course? How to create it?
What is "a course" good for?
Courses with bell icon
What are official and unofficial courses?
How to change course settings?
How do I use my last year's teaching plan?
How to delete a course
How to restore a course (with plan) deleted by mistake?

Courses with devided classes:
Divided and joined classes
Divided lesson does not display correctly in the class register
Two teachers teach a subject divided into groups in one class. What about the plan?
I teach both students' groups in one class. Should I create one or two courses?
Can the students groups be copied from the previous school year?

Special situations:
Subjects with more components
=Lessons with whole class and divided class
Teachers in students' groups alternate. How to create a course?