The first and only paragraph in the set of rules of art is §1:

§1

In arts are no rules except one:
In arts are no rules!

When making art you may get good pieces of advice. There are tips, empirical values and strategies. There are a lot of good an usefull things. But:

There are no rules!

The worst, which this course could cause, would be, if you get the impression: "you have to do something in this or that way..." Often you will get the best results, if you do something in an totally different way people normally would do it. For example, if I give the advice, not to use an eraser, then this doesn’t mean, that you are not allowed or even that you should not use the eraser. It only means, that you should consider not to use an eraser and that you nevertheless should try to use it, that you could drive well by not using it for a certain time, but that there always are situations, where you can and should use it. All tips, rules, advice and strategies given here are meant this way.