When I concentrate on plain walI, I see tiny dots and fuzziness. Is it due to vitreous liquefaction?

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You are right. It happens due to vitreous liquefaction with aging. The condition you are describing is known as floaters. They are perfectly normal. It occurs earlier in myopes or people using minus power glasses. They are a matter of concern only if you see a sudden shower of floaters. It may be due to pigment release from a hole or a break in the retina. In that case, a dilated retinal examination is required to be done by a retina specialist.

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You are correct. Ignore it unless you see a sudden increase in floaters or you notice flashes of light associated with floaters. Flashes of light is a sign of a phenomenon called posterior vitreous detachment in which our vitreous jelly separates from the retina. In that case, retina might develop small holes due to traction at places where retina might be weak or where the attachment between the retina and vitreous is strong.

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An entoptic phenomenon is a visual experience that has its origin from inside the eyes. They typically occur against a bright source of light, like watching the sky, or someone pointing a torchlight towards you while you close your eyes. You can see your WBCs coursing through your blood vessels. The transient shapes may also occur due to a break in your tear film which gets replenished the moment you blink. Usually, it is not due to an entoptic phenomenon.

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Sure. There is nothing to worry at all.