Calibre is a fantastic Ebook organizer. It can handle all sorts of file conversions, firmware updates and de-DRMing books you own. Whichever eRader you get - I would highly recommend it.

It is the iTunes to your iPod except for eReaders. It is also FOSS.

E.g. Here are 5,000 books available for free forever as part of Project Gutenburg.

That’s is download, and click Sync within Calibre. It handles all formatting, metadata, etcetera. Good luck accessing them without third party software. Kindle, Kobo, B & N do not want you reading free books.

Separately given the price differential these days. Get an eReaders with a back/front-light. eReaders are as difficult, if not more, to read as books are without bright light.

eReader lights point into the screen instead of at your face - it’s much different than a phone and much easier on the eyes. It’s like staring at a lightbulb (LCD Phone) vs staring at a newspaper lit from overhead.

I don’t know how much time I have spent reading in bed with-backlight-on not bothering my wife but it’s a lot. It’s where I do the majority of my reading. Not possible with a real book - she’s a light sleeper and any light bright enough to read would keep her up.