Hi, can anyone advise for LM?

I noticed there is these 3 tags.. (under the trial version)
Courses, Numbers & Math.

If i signed up for the lifetime. Do i just follow the lessons stipulated under Courses?
When do i use Numbers & Math?

and also, for Courses, is it like Little Reader with weekly program telling us which lessons to each our kids?

and how many lessons are there in LM (total Semester 1 & 2) ?

Appreciate advise. Thank you.