@blossom If the course is super cheap, super short, chosen because it's 2 minutes from your front door etc etc. Then an adult should be able to use common sense and deduce they will not receive an oxford level of education. People should take responsibility for their choices & cutting corners in training seems rife on sg.
It's not the end of the world. People make mistakes. You can do crap courses and still end up fantastically skilled. But you have to have enough impetus to self teach & fix the knowledge shortfall - i.e. buying 1 core textbook & being motivated. Nothing the op says is beyond googling solutions. But she hasn't!
I am always respectful to others. I have not been rude to the op. It is unfortunately all too common for people to get upset when they don't get the response they want.