Hi
I have over 100 members in an e-commerce site,i want to do a history of each member:
-In which date he has registered to the site for the first time.
-When he stopped his account
-When he reopen his account...
-How many tutorials he has registered for during each period of his membership

For example if from "Date1" to "Date2",he had 1 registered tutorials
from "Date3" to "Date4",he had 4 registered tutorials
from "Date4" to "Date5",he had 2 registered tutorials

EveryTime the profile or the number of tutorials assigned to a specific member change(even though if he did a slight change),i want to be able to track it and saving it.

I have no clue about how to do this project.
Can anyone guide me?
thanks in advance