Studying...

I was researching highlighter codes for the Old Testament, or the Bible in general because I'll be re-reading it soon and I want to do a study of sorts... Anyways, one of the posts that I found while researching said that when you highlight & write in your Bible as you study it becomes your companion. I tried to find the article again, but couldn't so you'll just have to trust me that's what it said. Anyways, I'm very excited to start on this Bible study, when I finish my chronological Bible plan. Anyone have any suggestions on highlighter colors?