Q.prunig a maple tree
I have a maple tree, probably 40 yrs. + old and 40′ high. I would like to cut off some low branches.
Is this ok to do, or will it kill the tree?

Certified GKH Gardening Expert
Yes, you can remove low-hanging branches on a maple tree. It's best to not prune the upper branches on a mature tree, but removing the low branches is fine. Here is more about how to do it:
https://www.gardeningknowhow.com/ornamental/trees/maple/maple-tree-pruning.htm
https://extension.missouri.edu/p/G6866