Don’t try all the exotic practises in the initial 1 or 2 years. Initially it is recommended only to observe breath, and may be the 4/4/4/4 technique mentioned in another comment, you can try the 4/4/4/4 technique by inhaling through one nostril and exhaling from the other. And gradually increase the count from 4 to whatever you are comfortable with.

https://www.banyanbotanicals.com/info/ayurvedic-living/livin...

Recent Yoga teachers, try to teach all types of Pranayama to a beginner, but when reading books written 100 years back, it is mentioned that mind and breath are linked tightly, and practising techniques which isn’t recommended for your condition, by an experienced guru, can actually make you mad.

Look for "baba ramdev + pranayam". There are a ton of videos online with him teaching pranayam. Like with all things of this nature there's a whole lot of junk surrounding it (marketing etc) that he also indulges in but the exercises themselves are good. Here's what I could find.

You might find some books at patanjali[1]. They have a good list of exercises although the BS part does appear in some books.

[1] https://patanjaliayurved.org/product-category/patanjali-publ...

first 3-7 years of intensive physical practices then only begin to investigate pranyama.

https://shadowyoga.com/newsletter/pra%E1%B9%87ayama/

""" Clarity about the required procedures, the appropriate tools and their use will allow one to tread the path of self-cultivation with the minimum of setbacks. Confusion will result in the multiplication of these setbacks, and the accumulation of injuries and disappointments will eventually result in the collapse of ones undertaking. """