eBike technology explained

Hey everyone!

Just joined the forum and super excited to dive into all things eBike! I've been riding my Aventon Level.2 for about six months now, mostly commuting 15 miles round trip with some decent hills, and I'm absolutely loving the boost. I'm really curious about the tech behind these machines – things like motor types (hub vs. mid-drive), battery chemistry, and how torque sensors actually work. What's one piece of eBike technology that really blew your mind or that you think is essential for new riders to understand?