When using the conjunction "not only...but also" (or "not only...but"), place a comma before "but" if the second part of the sentence is an independent clause (that is, if it expresses a complete thought and has a subject and a verb).

Since "neither" (or the pair "neither/nor") connects two ideas, subjects, or objects together, you should not use a comma to separate them.

Generally, you should not use a comma before or after "either" when acting as a conjunction, determiner, or pronoun. However, when acting as an adverb (to agree with a negative statement), the use of comma before "either" is optional.

As a general rule, do not add a comma before or after "both" in a sentence. However, you can use a comma after "both" to serve a grammatical function, such as adding a non-restrictive expression or starting a sentence with a dependent clause.

Use a comma before a coordinating conjunction to separate two independent clauses. Often a comma is unnecessary when the coordinating conjunction is not followed by an independent clause.

As a preposition, do not place a comma in front of "for" unless using a particular sentence structure where commas are required.

If the coordinating conjunction "yet" introduces an independent clause, place a comma in front of it.

Place a comma before "nor" to join two independent clauses. Do not use it to join two subjects, two objects, or two verbs.

When starting a sentence with a subordinating conjunction, use a comma to separate both clauses. In mid-sentence, the comma is unnecessary.