New to eBikes - where to start?

Hey everyone!

I'm completely new to the eBike world and have been seriously thinking about getting into mountain eBiking. I love hitting the trails, but my old analog bike just isn't cutting it for those longer, steeper climbs anymore. For those of you who've been riding eMTBs for a while, what's the one piece of advice you wish you'd known when you were first starting out? I'm looking at riding mostly technical singletrack, maybe 15-20 mile loops. Any tips on what to prioritize or look out for in a first eMTB would be awesome!