Q.best time of year to cut down trees
When is the best time of year to cut down trees, regarding most likely death of the stump? It seems that sometimes when a tree is felled, the stump dies, but others will continue to sprout out for years. Does the time of cutting affect this?

It can be the time of year, if the tree was actively growing.
It can also be the type of tree.
Here are some articles that will be of help.
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-stump-removal.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/kill-zombie-tree-stump.htm
https://www.gardeningknowhow.com/ornamental/trees/tgen/how-to-kill-a-tree-killing-trees-in-your-garden.htm