For the methods of CO2 diffusion, a more elaborate introduction and step-by-step guide to the inline CO2 reactors would indefinitely help beginners.
I can try to elaborate more on the inline CO2 diffusers.
All the other methods of diffusion are pretty much self explanatory, but those reactors confused me to no end when I first heard about them, in terms of how to build them and where to buy them etc.
How to build them and where to buy them may be beyond the scope of this article. There are lots of good links, however, that I might just link to in my article.