Coordinating conjunctions are FANBOYS!
Yes, FANBOYS is a mnemonic you can use to remember the seven coordinating conjunctions:
Coordinating conjunctions can connect words, phrases, and clauses.
A coordinating conjunction joins two main (independent) clauses which are equally important and relevant.
When you connect two main (independent) clauses with a coordinating conjunction, you should use a comma. N.B. Do not use a comma after the coordinating conjunction.
main clause + [ , ] + coordinating conjunction + main clause
Sam brought a bottle of red wine, and we drank it together in front of the fire.
She tried to read the novel in its original language, but it was too difficult.
Anna needed some money, so she took a part-time job.
Right or Wrong?
Is it right or wrong to begin a sentence with a coordinating conjunction?
Some teachers (and grammars) argue it is. Many others think it is not.
The fact of the matter is that you break no grammar rule if you begin a sentence with a coordinating conjunction. However try not to begin every sentence with a coordinating conjunction and start a sentence with a coordinating conjunction only if it helps improve the flow.
Independent Clauses in English Grammar – a look at clauses in context.