In 'Banshee', we have two teenage friends skateboarding. This two shot shows their friendship because they are partaking in the same activity and heading in the same direction. Their skateboarding is relaxed and they are laughing, showing their ease with each others company.
This is a shot that contains two (or more) characters. By placing two characters on a screen, the film-maker is saying that there is a relationship between them. This could be positive (friends, lovers, business partners etc), or negative (enemies, argument, disagreement etc). The difference between these is usually based on where the characters are in relation to each other (space between, higher or lower etc), and the way they act towards each other.
This two shot in 'Greif' shows the rage between a mysterious stranger and the husband - the stranger has a power over him as the husband is unable to flinch or move away- despite a tense prelude where the husband seemed in control and assertive.
This two shot again from 'Greif' shows the wife cradling a bleeding out husband - we assume that it is love and fear she is expressing as their world crumbles down around them. This two shot is enhanced by the chaotic camera movement and the grim sound of his gurgling and her screams.
This group shot from 'The Sermon' shows three characters that all seem to be facing the same way (normally indicating they have a commonality), but we can see the man at the back glancing with menace to the girl in the foreground. This shot shows that this group isn't all that friendly, and that she is unaware (or so we would be led to believe).
A group shot from 'The Sermon' shows a malevolent crowd of conservative & backward thinking church-goers. This shot shows they are unified as a lynch-mob in their hateful expression against LGBTQI communities. It also shows two of the key leaders leading the crowd, making them deserving of their fate later on.
This two shot from 'Smiles' shows a girl and a man who are affectionate and clearly in love as they talk about meeting her parents. This recognisable and familiar situation endears the audience to the couple. Of course, things will change and contrast this moment, making the later 'weirdness' that much more horrific.