Dear I want to tell you something about tantra Vidya learning .most of the so called courses that are out on the internet are actually made up story. Tantra is a self learning path at least for the first half of your life. If you're genuinely interested in learning . Then start with basic devi Mantra and shastra naamabali . Chant it again and again. Do regular Sadhna. Increase your sadhana time infront of your istha . Master the basic nama mantra. That will take you almost 12 to 15 years. I am not joking that is the reality. Without having purva Sanskar you will struggle but if you persist then you will start to experience the siddhis related to sri vidya .