Smooth animations

So, first of all is incredible there is not a real serious video tutorial fort this program.

Than, I am trying to make a smooth animation, i don't know how to say it, I mean not frame by frame.

I saw some people just moving an object from one side to another and then the object just move on its own to the final place. All with a smooth movement even if is in one single step, the frames fill automatically... did I explain clear? (and sorry for my english, I barely speak it)

I tried with interpolation, but it doesn't work, I tried all of the options, nothing happens