Image-edting for beginners

Hi, i am pretty much of a noob and hope you can help me ;)

So what i want to do:

Cutting of an element from a picture and "implanting" it into another one.
Of course you need editing to adjust the element, so it acutally fits in the picture.

And how can you "implant" a element into a gif?
I mean it would be a picuture in motion, or?

Can you name some program, which are very easy to handle even for a noob?

Thanks for help.