Read patanjali's yoga sutras i prefer if you got Vivekananda's translation... I feel it is the most authentic. Obviously get the free pdf or ebookb don't wait for the hard cover to come...
I would also recommend to ask chatgpt for a quick summary before you start... So you have an overview of what goes on before you dive in.
I forgot the specific details...but i will tell you what i focus on later from that book
Good luck my love...