Stage platform is the part on stage

Staging platforms is the part that you step on while on stage, it is supported by the stage legs underneath, those things are usually made of aluminum, or sometimes steel. Stage skirt is used to cover the side lines of the stage, if you don't want people to see the internal structure of your portable stage, then this is vital. The last one would be ramp. It is as the name suggests: a portable stage ramps, used to transport heavy things and equipment onto the stage.

Portable stage building can be easier than they appear, usually you won't need more than basic tools to get it installed, the right order of setting up the stage is very important.