Attached Link: Ted's Punctuation Guide

There are a number of online and hard copy resources that are good to have at hand.

The Elements of Style by William Strunk, Jr. is well worth reading.

Remember, punctuation is simply a way of clarifying your meaning. If you have too many commas, a semicolon may be needed just to keep your sentence moving. A colon asks for a little extra attention by saying: "Hey, there's a list or a bit of dialogue here." Poor, misused apostrophe is for possessives, not plurals. A lot of it is just common sense...thinking about what you really want to say.