Macbook Air M1 charger
Can I use my Macbook Air M1 2020 charger to charge my iPhone X
iPhone X, iOS 14
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Yes, see the following from Charge your iPhone with an iPad or Mac notebook power adapter - Apple Support
You can use Apple USB power adapters for iPad and Mac notebooks to charge iPhone, iPod, Apple Watch, AirPods, and other Apple products.
Also see: Fast charge your iPhone - Apple Support
Note that you will need to buy a USB-C to Lightning cable if you don't already have one. USB-C to Lightning Cable (1 m) - Apple