An effective way to tackle any subject is to start with the kids' book on that subject. Then maybe move into the dummies or idiots’ series of books. Then move into the general textbooks. Then read books by specialists in the field that each give their view of the same subject.
Or you can skip all that and watch the Standard Deviance course on any subject. In this case, it is Standards Deviance Geometry.
Their humor is not that humorous. It is presented in a sort of soundbite form; however, they do have some mystical way of making the most complex subjects so simple before your eyes that you wonder why you have not learned it that way.
Tests are not my forte however the standard deviant tests are designed to help you retain the information needed for the next part of the course.
When you have finished everything, you look at, becomes lines, points, planes, angles, etc.
You will want to play this over several times even though you get it the first time.
I do have to admit that I knew geometry before I watched the DVD but for some reason, it made it clearer by putting everything in order.