Monetizing a dev oriented e-learning site

Hi all, about a year ago I wrote a series of posts about learning Ruby from PHP examples: https://phptoruby.io

I've never really thought much about monetizing it. I wasn't sure if there was enough traffic to do so in the first place. I kind of just wanted that knowledge out there for others like myself that were going through a professional transition.

Besides Carbon, which seems to be only available for larger dev oriented audiences are there other affiliate or ad networks available for the developer audience?

Perhaps I should place some banner ads for Ruby jobs?