I encourage you to read through this manual once a month for six months. The more time you spend on the mat, the more sense the Principles will make. Your understanding will deepen with continued practice, but for your practice to be fully fruitful, it needs to be viewed through the lens of authentic yoga and this is the goal of this manual.
Besides having a handle on the Principles, every time you step on your mat, your focus needs to include the 5 Pillars of Practice. The ancient yogis viewed all of life through the prism of the natural elements: Earth, Fire, Space, Air and Water. This comprehensive approach assures you address the complexity of the human condition as you learn how to dive deep into your mind, while you are simultaneously engaging in the world of action.
If something is worth doing, it is worth doing well. If you know the what and why of what you are doing, you are in a much better position to do it well.