The newsletter will be very short as there is not much going on in the bee world in October.
The main thing to focus on for the month of October is to feed your bees. Make sure you are done feeding by Halloween. Your bee's have already started to slow down and you should already see your bee population start to decline. It takes a significant amount of energy to convert sugar water into honey stores. This is primarily the summer worker bees' job... not the winter worker bees' job. The winter bees can do the job, but if they are exposed to ware and tear early on they might not be able to do their duties in the winter.
You can check if they need food by cracking the top brood box and lifting it slightly. If its heavy, you should be good! If its light or medium weight, you might want to feed them more.
Bees can starve this time of year. If you go out and find a dead hive, you can still use those resources for another hive. If other hives need comb you can use the new resources you now have. Similarly, if a beehive dies during the winter, you can use the leftover honey to feed another hive that is still alive.
Below I've attached a video from The Canadian Beekeepers Blog. Ian does a great job of describing feeding and bee clusters for winter. He also talks about sustainable yield in beekeeping!