Welcome to Construct 2. Construct 2 is a really simple enigine to start programming and get experience. You asked many beinner questions. I think the best is to read tutorials or watch tutorial Videos. I started with this. Soon everyrhing will be clear for you and if not than just ask in the Forum. Here is a tutorial wich will answer many of your queations: https://www.scirra.com/tutorials/253/ho ... tform-game
(And the data storage is the possibility so save the place where you stood or your Level when you played your game.)
Have fun and Keep going
[Edit] i saw your last post. Do what the other adviced you and read the tutorials. Dont start programming your dream game before you never programmed a simple game.