Most ereaders will support some basic fonts natively and you won't need to tinker with them at all. However, if you do want to change things up, a Kindle or a Kobo is a good idea as they both make it easy to change fonts on the device.
You'll find that the Kindles have some custom fonts designed by Amazon, with Bookerly and Ember being the most popular ones. We found that the list of fonts on Kindles is extensive enough that we didn't find the need to sideload more, but you can if you need to.
Kobo devices also have their own set of default fonts, but there's no rule against sideloading more, including Amazon's own custom ones like Bookerly. And sideloading is as easy as plugging your Kobo ereader into a computer and moving your desired font to the device's fonts folder.