What Are The Main Differences Observed Among The Six Kingdoms?

In order to answer your question the source of your question is needed for example: Bible, Torah, Qou'ran, etc. or some other faith tradition.

If your question refers to the six kingdoms of life used by Botanists, Mycologists and Zoologists, then your question is related to the natural world, rather than to religion. Previously  only two kingdoms of life were considered: Plant and Animal. Today these are divided into six kingdoms of living things, however the names vary dependent upon the person who developed the system for classifying living things.

If, you enter the six kingdoms into the search bar there are a number of sites on this topic.