Recommended Yoga Centers Beginners and Certification Courses

Hello, Been born and bought up in Mysore! I don't still understand the Yoga scenes out here near to Gokulam and other areas. I started doing Yoga at the age of 10 and I learnt it all for free. (All thanks to SPYSS centers sprawled around the city who are teaching quality yoga for free to giving service to society. Teacher under whom I learnt had really in depth knowledge on each Aasan, breathing techniques and postures, and was really spiritual as a human who taught beyond yoga about Chakras, Pranayama, several effective mediation techniques). I was baffled to know there are many centers which charge 15-20k/month in few centers. Lot many friends from outside of the region ask about these yoga centers which are in Gokulam and other areas where they give you Yoga training and also certification and they are very keen on attending them! I don't have any clue about them. I don't want to let their thoughts down as well. I had few doubts: 1. Firstly, if you have attended the any classes by old teachers or the old gen who teach it for free or charge very nominally. And also tried yoga at taught at centers at Gokulam. What's the difference you have seen? Is there any big difference in what they teach? 2. My friends are keen on joining centers in Gokulam as they give certifications and pays individual attention to them while learning. And also get good peer group comparatively to free ones. Any yoga centers you would recommend for them? (They are beginners)