Then I bought this book and it helped me a lot:
https://www.amazon.com/Network-Programming-Go-Adam-Woodbeck/dp/1718500882/ref=mp_s_a_1_6?crid=F45XP5CCW1BU&keywords=network+golang&qid=1656111804&sprefix=network+go+lang%2Caps%2C60&sr=8-6
You need to have a lot of grasp of Go though as the author assumes you know a lot of stuff.
https://www.amazon.com/Network-Programming-Go-Adam-Woodbeck/dp/1718500882
https://www.amazon.com/Network-Programming-Go-Adam-Woodbeck/dp/1718500882/ref=mp_s_a_1_2?keywords=golang+network&qid=1643203856&sr=8-2
there's also this book, which has much better reviews but doesn't have a free online version