This might be an unpopular thing to do, but lately I've been literally having claude/chatgpt write books for my personal consumption: things to brush up interview skills, python, system design, and even agentic coding. I've also had it aggregate substack posts for me, etc.
I have it generate an ePub file, and drag and drop it to my kindle.
It's a great way to take information with me, out for a long walk where I can focus on it and absorb it.