If you are hit from behind it is usually always the guy that hit you that is At Fault unless you were in reverse backing up
The car that hit you from behind.
is fault of car behind the second car not yours
It is their fault.
The car behind you
yes
If you changed lanes and hit a car in the lane you are trying to get into you are at fault.
First, you shouldn't be cutting people off. Whom ever hit the other car from behind would be at fault.
you are at fault
The car that hit you from behind is at fault.
The person who hit a parked vehicle is at fault.
Yes, you are. It will be viewed that you were following too closely.
If you hit a car from behind, you are going to be held to be at fault. If a car hits you from behind, they are going to be held at fault. Most jurisdictions consider hitting the back of a car prima facia evidence that you were following too closely. You could literally have six cars at fault in this case, each one for hitting the one in front of it.