Is the meaning of "class" the same as that of "course" and "class" in taxation, "encouraging classes to cultivate farmers" and "team leader"? Still related?

[Tax] It was called tax in ancient times, also called "tax".

Encourage supervisors to engage in agricultural production. Attend classes, supervise and persuade.

[Head] subject manager. Classroom, science.

[Course] To arrange chapters in a planned way. Class, subsection teaching.

[class] study subjects. Classes, teaching subjects or planned subsection teaching.