Actually, a complete idiot would trouble with this tutorial. The real intended audience is scientifiacally oriented and pressed for time. The objective is to provide an acquaintance with the technology and terminology relevant to Earth-orbiting satellites.
Washburn, Alan R.
"Set and Drift,"
Naval War College Review: Vol. 52
, Article 8.
Available at: https://digital-commons.usnwc.edu/nwc-review/vol52/iss1/8