eBike technology explained

Hey everyone!

I've been diving deeper into custom eBike builds lately, and it's got me thinking a lot about the nitty-gritty tech behind these machines. Specifically, when you're building from scratch or converting, how do you guys approach understanding and integrating the various components like motor controllers, battery management systems (BMS), and display protocols (UART, CANbus)? It feels like there's a whole world of compatibility and optimization to navigate.

What's one piece of eBike technology that you found particularly challenging or rewarding to understand when doing a custom build, and how did you tackle it? I'm curious about everything from motor winding types to advanced regen braking setups!