Not everyone knows how to raid for gold. This is a great way to do it, if you find a bunch of inactives, that are a specified distance away, you can repeat raid them for max gold while you sleep. Basically, you want your creatures to be able to raid them regularly, on repeat so that by the time they get home and go back out again there is gold in the vault to pick up again. It's good practice to keep note of which inactives have vault stackers with no traps, and continually raid them on multiple long walk raids.
You can do this as well for food and for resources in the mine, but nothing is quite as rewarding game wise, as the gold.
If something else comes up on the forums, that maybe not everyone knows but you want to share with friends, please post in this thread.