You can always buy books such as the MGMAT SC book or PowerScores CR book. If you don't want to shell out the money, you can learn as you go from the OG11 book and the CR in that book. Combine that with CR/RC/SC notes from this site and you should fine some good material.

What I've found works best for me is to keep a lessons learned log for each topic of Verbal and take copious notes about anything you've learned even the littlest things. I have a blog post on the GMAT Strategy forum where I've been posting my lessons learned in case you want to see what I'm talking about.