Motorcycles

Same way you do anywhere else - use them properly (seriously not being snarky, there's really only one area where there's a difference, which I discuss below). Keep in mind most bike clutches are wet, so have better cooling capability than cars (though BMW likes a dry clutch).

Hills aren't really any different, and with modern vehicles brakes don't fade like they used to (especially on bikes).

Though, since a bike does (almost always) have a manual gearbox, let engine braking handle any long downhills where you need to keep speed in check, and use brakes in short, firm decelerations.

For example, there's a long downhill on I70 in Colorado, so long it has a sign saying "Truckers You Are Not Down Yet - 7 More Miles of Downhill". On such a long downhill, downshift just enough that engine braking keeps you at your target speed (say 65 mph on that hill). Then if you do start running fast, or getting too close, use the brakes firmly, not lightly, to quickly bring your speed down.

This works best because it heats the brakes intensely for a few seconds, but then gives them a relatively long time to cool off afterwards.

If you were to just lightly hold the brakes to slowly slow down, the discs would heat just as much (if not more), but you'd have less time between braking cycles, leaving less time for them to cool.

I've experienced brake fade on such downhills, it's no fun (in a truck). Passenger vehicles don't often have as advanced materials in brakes as bikes do, and this particular one had relatively cheap aftermarket pads, and I had been used to it with factory pads. Big difference.

I've watched trucks going down such hills with their brake discs glowing hot enough to see in daylight - they had to be riding the brakes a long time for that.

Essentially, any brake system could emergency stop a vehicle at speed on such a downhill one time, so best to keep them cool for as long as possible by using engine braking.

All that said, on my 35-year-old, 700lb "sport" bike, I've never experienced brake fade on downhills like that. The brakes are so oversized relative to the mass of the bike, it's just not a concern. But I still use engine braking - why take a chance.