Torque wrenches, while straightforward in concept, require much different use and care compared to a regular ratchet. This can be confusing to someone who has never used one before. There are several answers to be found on SE but it requires a lot of searching for specific queries.
This question is focused on mechanical "click-type" torque wrenches as they seem the most likely type to be used by a home mechanic.
I'm looking for standard practices on:
Proper use of a torque wrench which prevents damage to both the wrench and the object being wrenched upon;
Proper care of a torque wrench which will ensure a long usable life (including maintenance and storage procedures, e.g., storing at lowest setting).