eBike technology explained

Hey everyone!

I'm looking to buy my first eMTB soon, and I'm diving deep into all the different tech specs, but honestly, it's a bit overwhelming. Things like torque sensors vs. cadence sensors, different motor types (hub vs. mid-drive), and battery chemistry all sound important, but I'm struggling to understand the real-world impact on my riding experience. For someone who plans to tackle some decent hills and longer trails (20-30 miles), what are the absolute must-knows about eBike technology that really make a difference? Any insights or simple explanations would be super helpful!