Never cock the shutter before setting the shutter speed, with some youi could cause severe damage should you nneed to move from say 125 to 10, and never leave the shutter cocked,set the speed, cock the shutter and compose and fire,then repeat for next shot, carry6 the camera, folded or not, uncocked otherwiise if you forget to fire and leave a few weeks or perhaps monthes the next time you want to use the camera the shutter can freeze, and it is best to store them with the shutter set to the slowest, normally 1 sec,
Richard