There are a few steps I use to seo optimize my old posts with keywords. Let me share them with you:
1) Once you’ve chosen an old post you think holds value for your readers, use Google Analytics to analyze and choose 5 top keywords from the past to that post. Put them on a notepad somewhere.
2) Go through and update the post as needed giving mind to the keywords you plan to put in.
These are the best links I ran across in the past week written by bloggers about