This is a type of embroidery from the Indian state of Gujarat, and is especially popular in the Kutch and Bhuj regions. It’s closely related to Armenian embroidery – they both use interlaced herringbone stitch. The Indian designs tend to have a different style to them than the Armenian designs, I think. There are a lot of wonderful resources on the internet for doing Kutch work – lots more than there are for Armenian embroidery!
Bhavani Harikrishnan has a beautifully illustrated tutorial on Kutch work in four lessons. Each step has both diagrams and many very clear, very nice photos showing each move with the needle. I’ve put a few of them below to inspire y’all to go check it out. (If you like video tutorials and have some time, then Mridula’s School of Embroidery has a Kutchwork Embroidery Series on Youtube.)