Practical masonry and hardscaping advice from the crew that does the work.
A leaning wall is almost never a stone problem. It is a water problem, and the fix is behind the wall where nobody looks.
Two patios can use the same pavers and look identical on day one. Four winters later one is flat and one is a trip hazard. The difference is under them.
Chimneys take weather from every direction at once. Most of what goes wrong is visible from the ground if you know what you are looking at.
Every visitor uses them, every winter attacks them, and a quarter-inch inconsistency in rise is enough to catch a toe.