Recommended
Making Cooler/Generator with Thermoelectric Device
Why people recommend it
ElectroBoom's experiments with Peltier elements get suggested to people planning thermoelectric cooling or generation, as a realistic look at what these devices deliver.
Watch for: Useful for reality-checking power budgets
In their words
Also watch ElectroBoom's video where he messes with Peltier elements:
Bimpelrekkie on electronics.stackexchange.com, Dec 2021. CC BY-SA.