Overhead establishing shot – what does this achieve?
This helps the audience familiarize with the location. It also shows the positions of the chararcters and how the actions are going to take place.

What is Shot-Reverse-Shot?
This is when the shots cut from one person to another and then back to the first person again. It is to show two people having a conversation. 

What is Eye-line matching?
This is when two chararcters are talking to each other and you make sure that their eyeline in each shot is looking up at each other. For example, if someone is standing up they will be lokoing down and the person sitting down will be looking up.  

Why do we cut to the other members of the group?
We cut to the other memebers of the group so that we can see all of their reactions to what is happening. This helps us understand the atmospher of the scene. 
What is a wipe?
A wipe is when you cut from location and time straight to another. For example, a group of people sitting in a pub set in the present, cutting to a shot of an abandoned building two weeks prior. 

What is the effect of using quick cuts?

It creates a fast ryhthm which keeps the story moving along and the audience on their toes.