Elaboration on one subjek that I like

My favorite lesson are Investment management.
Previously, at the moment that still at school, I more like with lesson about theory than numeral.
But I don't know why since University Lecture I more like lesson to need intelligent brain.
I like Investment Management at the first because very interest and to easy for understand me.
from that, I conscious if investment management is not difficult. I also enjoy to study that lesson.