The phrase "easiest course" refers to a class or subject that is considered to be simple or not very difficult to understand or complete. Full definition
If you have yet to take part in our program, Sign Up Now to experience our Quick and Easy course for yourself! (onlinetraffic.com)
You'll be able to complete our Quick and Easy course at your own pace by logging on and off as you please. (delawaredriver.com)
The fourth significant point he made was that students and teachers discussed and demonstrated just how easy those courses were to cheat. (voiceofsandiego.org)