The developer documentation mentions at several locations:
Always use the Query Builder.
But where is the meat? I couldn’t find any pages describing where to find and how to use it.
Even the tutorial for app development is lacking this. Why is there at least not any tiny example if you recommend (or expect) to use it?
Searching the forum gives one single hit from 2017. This might help, but real documenting such an important tool should not be missing.