Writing Ethnographic Field Notes (2011) is useful, if a bit dated.
https://www.amazon.com/Writing-Ethnographic-Fieldnotes-Chicago-Publishing-ebook/dp/B00631IE94/ref=mp_s_a_1_4?crid=2WS1Z7H43Y90U&keywords=ethnographic+field+notes&qid=1636765048&s=digital-text&sprefix=ethnographic+field%2Caps%2C55&a...