Difference between general, airframe and power plant concentration courses
The US Mechanic certification has two components, Airframe and Powerplant. The license is generally known as an "A&amp;P" license because most candidates choose both. There are, however, three exams. The third is the General knowledge exam. You have three choices for licensing:


Airframe only
Powerplant only
Airframe &amp; Powerplant


For all three options, you must take the General exam as well. Taking a general course will only prepare you for that exam, which does not lead to any license or certification.