Use a compact CRS triage deck before measuring, buffering, or publishing spatial outputs.
What is the first CRS question before measurement? What CRS are the geometries stored in, and are its units appropriate for the calculation? A layer can render correctly while its units are wrong for distance or area. Preflight Stored CRS or analysis CRS? Do not confuse jobs Store and analyze can be different choices. Transform deliberately. The map looks right, so the distance must be right. Stakeholder pushback during a deadline review. Your line The display is right; the ruler for this calculation is the part I need to fix. Do not lecture on projection theory before naming the business…
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