You're welcome, and thanks for reading =)
I will for sure! The most extensive article so far is about Facebook ads actually, and will be #3 or so in the series - There I go through all the different objectives, as well as set up a real ad I have been running until now. With the actual results from it as well.

As for engagement, Facebook often requires you to pay up a bit. Organic reach is low if you don't post great content often, or if you just got a lot of new fans etc. But now that we understand context better, the article about Facebook ads will also make a lot more sense once it's out 😉