Fast shutter speed, good solid grip on the camera, elbows tight in, lean against a wall, lens (or camera) with image stabilisation, breathe out as you take the shot.
As someone who is also shaky, these will help. Over time, you'll get an idea as to where your ideal shutter speed lies to protect you from shake. For me, if my shutter speed is slower than 1/(2x focal length) I need to try and find a way to make it faster or risk blur from me. Auto ISO can help keep your shutter speed high and can be set depending on what you're doing that day.
And breathing is a good one. I take my camera out with me every day when I go for a brisk walk. Stopping to take a pic whilst still out of breath can affect the image, so I take a few breaths and let myself settle before taking the shot.