Long exposure photography using different strengths or stops in neutral density filters can produce amazing results. You need good quality neutral density filters that do not leave a colour cast and of course a sturdy tripod. Exposures can be anything between a second and many minutes. The longer the shutter is open the longer the exposure, and the smoother the water is or there is more movement in the clouds etc . I love LE at the coast as you can see from the shot below. These shots were taken with either Nikon DSLR or Fuji mirrorless camera.