https://www.tngun.com/easiest-way-to-cut-bamboo/
I have been collecting bamboo for a new dome at the land, and hand cutting it was SLOW. Because of the effort I decided to try my weed-eater with the blade attachment with the blade pictured to the left.

This was found to be the easiest way to cut bamboo that I know.

I haven't found a faster way to cut bamboo. Additionally, it allows me to cut the stubs of bamboo very close to the ground so that I don't step on them and trip. A weed-eater with a saw blade is by far the best power tool to cut bamboo.

If you don't have a weedeater, you should get one.