In object mode Alt-g clear location, alt-r clear rotation. Or press n and enter the values. If you have moved and rotated in edit mode you have just moved the verts and not the objects so the only way back would be with undo.
Yes it is normal. If you want to remember the original location you have to create the object and move its center to the origin (with center cursor) or parent the object to an empty and alt-o clear origin.
Yes it is normal. If you want to remember the original location you have to create the object and move its center to the origin (with center cursor) or parent the object to an empty and alt-o clear origin.