The Photographic Eye has a great video that discusses the importance of using motion blur in photography. In the video, they share some simple techniques you can use as you experiment with learning the creativity of motion blur.
00:00 Why motion blur is great
02:47 Panning and shutter drag
04:27 How much motion blur do you want to use?
08:21 Using the camera, rather than the subject to create motion blur
11:38 What makes these examples of shutter drag work?
12:51 Experimenting and discovering cool ideas with motion
14:13 How the pros use shutter drag