Coordinating Conjunctions

The short, simple conjunctions are called "coordinating conjunctions":
and, but, or, nor, for, yet, so
A coordinating conjunction joins parts of a sentence (for example words or independent clauses) that are grammatically equal or similar. A coordinating
conjunction shows that the elements it joins are similar in importance and structure:

Look at these examples - the two elements that the coordinating conjunction joins are shown in square brackets [ ]:
I like [tea] and [coffee].
[Ram likes tea], but [Anthony likes coffee].

Coordinating conjunctions always come between the words or clauses that they join.
When a coordinating conjunction joins independent clauses, it is always correct to place a comma before the conjunction:
I want to work as an interpreter in the future, so I am studying Russian at university.
However, if the independent clauses are short and well-balanced, a comma is not really essential:
She is kind so she helps people.
When "and" is used with the last word of a list, a comma is optional:
He drinks beer, whisky, wine, and rum.
He drinks beer, whisky, wine and rum.

The 7 coordinating conjunctions are short, simple words. They have only two or three letters. There's an easy way to remember them - their initials spell:
F-For
A-And
N-Nor
B-But
O-Or
Y-Yet
S-So