These are products I actually install and trust in my own work. I keep this list short on purpose: one recommendation per job, the thing I would put in my own house. The links are Amazon affiliate links; if you buy through them it costs you nothing extra and supports the free videos I make.
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The quiet fan I install when a bathroom fan is too weak or too loud: the Panasonic WhisperFit FV-0511VFC1. Built-in moisture sensor, so it runs itself when the air gets humid. Fits the existing ceiling opening in most retrofits, so the job stays small.
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The ten dollar ShowerShroom from my drain video. It hides inside a standard shower stall drain and catches every hair before it reaches the pipe. Lift it out once a week, wipe it, drop it back in.
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Small battery alarms that scream when water touches them. I put them under sinks, by the water heater, and next to the sump pit. A forty dollar five pack that catches the leak you can't see.
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The thirty foot Holikme kit from my dryer lint video. The brush spins on a drill and clears the lint out of the whole vent pipe in about twenty minutes, so once a year keeps your clothes drying fast and leaves nothing in the pipe to catch fire.
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