Nothing on the counter, nothing on the tables. Everything goes into cabinets, or drawers. What goes in cabinets is preferably packed tight (rolls of paper towels, TP, folded linens and towels all help to fill space.
Then you find out which cabinet doors can't handle the load of what wants to pitch itself out, and you fix or beef up those latches.
If there is something you need permanently on a counter or table top, it is best to bolt it down.
There is a first timer thing about putting stuff away in the kitchen like you might a home, then finding it all on the floor after your first ride on a rough road.
I was fairly comfortable driving my type C RV when I road tested before buying it, and the first few trips. Now with ten years and 30,000 miles under my belt, I am a lot less comfortable, knowing how other drivers behave around RVs on the highway, and knowing the stopping and maneuverability limitations of my RV.