Support and resistance are often taught as horizontal lines, while live price repeatedly turns a little above or below them. Calling everything a zone solves one problem but creates another: a wide rectangle can explain almost any reaction after the fact.
Begin with the evidence
A line is useful when the market has repeatedly respected a narrow reference, such as a clear closing level or an obvious swing extreme. A zone is more honest when reactions occupy a band: several candle bodies cluster around one edge while wicks probe another.
Mark the area from information visible at the time. Do not widen it because a later candle missed by a few points.
Choose the boundary rule before replay
Write whether the zone uses bodies, extremes, or a combination. Then advance the chart. If price closes and accepts beyond the invalidation edge, retire the zone. This rule matters more than finding the one “correct” drawing style.
Keep width meaningful
Compare the zone width with average movement on that timeframe. If a so-called level consumes much of the recent range, it gives little help with entry, invalidation, or reward-to-risk decisions. Move to a higher timeframe for context or admit that the chart does not offer a precise area.
The final test is simple: could another reader understand why both edges are where they are, without seeing the future candles?
Education, not a trade signal. Examples explain chart-reading principles and are not recommendations to buy or sell any instrument.