There will be 20,000 things gone over and shown to me during the delivery.
I wouldn't worry too much about this. Some dealers will take you through loads of things (which you will then forget), some will just show you the basics. I suspect my dealer didn't know much about the car.
Personally, my view is that as long as you know how to start the car and move off, you've cracked it. In default mode, the basics are like any car, right foot to go, left foot to stop. I'm not being flippant, I work with tech all day and I think the best way to learn new tech is a bit at a time. Your not going to take a lot in at the dealers, better to get used to the basics and how the car drives and then move on to, "OK, I've got this, now how do I do 'this'?". The dealer should also take you through linking your phone to the car and the BMW app. This is important and you can speed the process up a bit if you get yourself registered on the BMW website and get the app installed on your phone.
You've been waiting a long time for the car but only have a few posts. I hope you have been lurking! There is an enormous amount of useful information on the forum and their are members willing to help and who know the car much better than the dealers. Search for information here before posting, because many questions have been answered already. I knew a lot about the car, its features and limitations, before taking delivery, thanks to other forum members.
Update your forum profile with your specific model and tyre size and you can put more info about your car in your signature. Make sure your privacy settings allow this information to be seen by other members. Then, when you ask a question, people can give you an answer that is more specific to
your car. You can see my profile on the left of this post and my signature at the bottom of the post.
If this is your first EV, I would definitely read this -
Recommendations to understand Range and Consumption (you're slipping
@ssh 😉) and also look at posts about regenerative breaking (bit like engine braking but much more controllable in an EV).
@ssh has mentioned one of the D modes (there are others) but there is also B mode (one pedal driving), which is quite a bit different and some people's favourite 😁. You don't need to know any of this before you collect your car though, whatever the mode, the brake pedal still stops the car!
Don't worry too much about taking any info in at the dealers. Just revel in the experience of getting a gorgeous car. Take it gently (at first 😉) and come here when you get stuck with something.