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Well, not aiming for “zero slack”, but “just right” with “some slack”. What happens a lot is people don’t have a way to measure chain-tension, so “zero slack” becomes only identifiable target. It really should be about 1mm with about 8-lbs push on chain.
With enough practice and experience, you can get a feel for right tension when pushing on chain. Until you get that feel down, chain should be checked regularly and tension inspected. Only adjust if necessary.
Hard to quantify, what you need is CCT with gauge. Some kind of calibrated mechanism to keep chain at proper tension.
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