Question 1).
Apt-get update ……does this update all software on pc or just updates source list.

Question 2).
Apt get install Xfee86 ..
will this install the newest version of Xfee86 video drivers?
After it is install are their any additional configuration that needs to be done.
(other than restart)

Question 3).
Can or does apt-get update or install newest kernal updates?
If show what is syntax?