What kind of stain are these?

One is left by leaves and pinestaw, can you believe it little outlines of leaves everywhere. What’s the technical name for that?

The other I have no idea- water doesn’t stick in those part pre cleaning and they don’t disappear. Could that be etched concrete I hear about?

Tannins I believe

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Thank you! is the white spots also caused by tannins?

Which white spots are you referring to?

The bottom image

I found this thread through Google
Looks like this is a muriatic acid stain, bleach won’t take that out, they say it has to be stripped and coated or acid it more (uniformly/properly) than coat it. Thank god I documented the stains before running it over with the surface cleaner, if it becomes a problem it will be my insurance policy.