Welcome to a whole different world of RV!
Lots of nice things to find but then with the added complexity of motorhomes we also get some added probelmsif we are not fully aware.
One of the biggest, most common items to jump up and catch newer users is the batteries. They seem so simploe and we have them in cars and trailers, so we may not watch them closely enough. And if we let them run down, it shortens their life.
Until you find exactly what you have, watch the voltages and if you have lead acid batteries, watch the water!
One confusing thing is that the two battery strings are connected when we drive but not when we store the RV. We can easily get fooled into thinking we can plug the RV in and it will keep both charged. NOT TRUE in many cases and depends on whether the RV came with a small item to keep the chassis charged or somebody has added it.
More fun if we don't get caught sleeping!