If you're coming to this page in search of jq related AWS commands, but come from xpath or e4x (jsonpath) domains, then you may find this article helpful: https://github.com/stedolan/jq/wiki/For-JSONPath-users.
Another good learning site: https://shapeshed.com/jq-json/
The jq playground (live testing): https://jqplay.org
A lovely tutorial: https://programminghistorian.org/lessons/json-and-jq