hello
i will try to explain everything i hope you can understand.

CBT:Center back
RB: right back
LB: left back
DMF: Defence middle field
OMF: offence middle field
CF: Center forward
SB: side back
CMF: Center middle field
in the auto defence thing which u asked as 2nd question this is the place where u can change the team defence put it normal is best thing.
Defence system:
Normal: normal
Sweeper: make a defender like a lebro(not sure if i spelled it right)1
Line defence: used for Offside plans
Mark setting as 3rd question
Covering: to cover the area when ur challenger play long pass to ur goal.
Mark zone: normal marking
Mark man: to make a player stay close to other player to mark him (m7aa9ara)
4th Defence
how you want the players to be defensive
when you dont have the ball how u want your team or players to go back and defened the goal.
5th Attack
How you want the players attack when u have the ball
quick setting is not realy good unless u want to change team style is fast way.
thank you i hope u understand