If you’re already at the stage where you can easily relax and calm the mind, then you’re not a beginner. It makes a great deal of sense to follow the system articulated by Patanjali. It is a comprehensive system that contains guidance from beginning practice through the most advanced.
One thing you will notice about Patanjali’s system is that it does not make any reference to raising energy or Kundalini, and references chakras only indirectly and in only one or two places. This is because it is based on Samkhya metaphysics. I much prefer this system because it is straightforward and unambiguous. Once you learn the terms, it is fairly obvious what they refer to and there is very little difference of opinion as to what they mean. Swami Rama’s article briefly explains the words manas, ahamkara, and buddhi. These are Samkhya terms.
A lot of confusion arises because we tend to think of the Vedic culture as monolithic when in fact there were different schools of thought. The concept of chakras and nadis is really a different metaphysical system, and in contrast, the meaning is ambiguous and there is a lot of disagreement on the details. The article posted in this thread does a good job of explaining some of the differences in philosophy.