what tables mean/how to read and adjust

the fundamentals didnt cover at all what the tuning tables mean, how to read them, how to actually make the adjustments etc. Will the practical course cover this? or did i burn 300$ just to learn how a diesel engine works (basic knowledge found everywhere). Do i need to buy another course to go over these basics? The course description made it sound like no prior tuning knowledge was necessary, but so far it seems like you need to know how to tune first and this just tells you how to apply it to a diesel application.