Commas, Periods and Quotation Marks

Do these seem, oh, so easy?  That's great!  But hang in there, you may learn something yet!

This will be a short lesson.

Commas and periods ALWAYS go inside closing quotation marks.  No exceptions.

One of my BFF's said, "You need to always wear bright colors."

I try to do the "right thing," but it isn't always easy.

 See?  I told you it would be short!