There is not really that many parts to a metal shed, Basicaly you have the Purlins, gurts, columns, Walls, roof, and trim, PURLINS, are usually Z shaped, and they are located in the roof, as part of the structure, GURTS, They are usually C shaped, and they go in the walls as part of the structure, COLUMNS, Are verticle gurts located in the corners, One of the main parts for structure, WALL & ROOF SHEETS, self explanitory, TRIM, Goes all over the shed, You got the corner trim, The eave trim, J trim (for around the windows), There are literally hundreds of different types of trims