Use Internal Links
Internal linking is SO money. Use 2-3 in every post.
BRIAN'S TAKE
If you want to see a great example of how to internal link on your site, check out Wikipedia.
They add keyword-rich internal links to every entry:
Obviously, they can get away with 50+ internal links per page because they’re Wikipedia. I recommend a simpler (and safer) approach: link to 2-5 older posts whenever you publish a new one.