The Preposition

Among (amongst) expresses:

a. Position in the midst of:

You can see my house among the trees.

b. Included in:

Maha is among (one of ) the world's greatest poets.

c. Sharing:

The sweets are to be shared among the five children.

At: "At" is used mainly to denote a place or point of time:

I'll see you at the station at for o'clock.

Before: "Before" generally expresses:

1. Time (contrasted with after):

Come and see me tomorrow any time before five o'clock.

2. Position, order: She sang before a large audience.

Behind: "Behind" express position:

1. In Space: The garage is behind the house.

2. In time: The train is behind time.

Below: "Below" generally has the meaning 'under':

The temperature is below freezing point.

Below contrasted with 'above':

To keep warm you need blankets above and below you.

 Beside: "Beside" = 'by the side of', 'near':

Go and sit beside Maher.   

Besides: In addition:

There are many others besides me who disagree with what you say.

Besides (as an adverb) can also have the meaning 'moreover':

I don't want to go for a walk, I'm tired, and besides, it's beginning to rain.