Namaskar Yogis

Which Yoga Aasan good for Migrain???

I want to know Yoga & psychotropic substances - is it valid or invalid? however, in our religious texts lord Shiva is witnessed taking it and if yoga is following his path so does it validate to have psychotropic substances? Whenever I am hiking up in the mountains I see so many yoga practitioners consuming it but I want to understand that is it right or wrong? as it confuses me.

Dear, I am 60 years old. I have knee pain, can yoga help me. My mother got her knee operation ten years back but her pain has never reduced. Can anyone suggest me, how Yoga can help me?

Cheers 

Asha

Hi, I am suffering from PCOD, I have a hectic schedule with office work, 6 months back I started yoga with a home trainer , I have no change in my body. Honestly, I get bad cervical after doing yoga practice. I think I am losing interest & faith in yoga . 
Any suggestion where I am going wrong .. I really want to bring that enthusiasm but no idea ..

Hello, there is so much chaos with Covid-19 around,  I am a pregnant female and I want to do chanting. Can anyone suggest me some good chants?