Coordinating conjunctions connect words, phrases, and clauses....There are only 7 of them.
An easy way of detecting one...use the word "FANBOYS." Each letter is the first letter of a coordinating conjunction...For, And, Nor, But, Or, Yet, So.
Subordinating Conjunctions are more numerous and sometimes a combination of words. They connect a main clause with a subordinate clause.
There's a 3rd type of conjunction......Correlative,