Simple Animation

Start a Blender!

Select object to animate by "Right Click"

Go to the first frame. Move object to any start position (use "g" key)
then, press "i" key. Select "Location"

Drag to any end frame of your choice (eg: 100).

Move object to desired new location then, press "i" key again
and choose "Location"

Done! Press "Alt" + "a" to preview/run the animation!