Many zoom lenses have some form of image stabilisation these days that uses gyroscopic sensors and a floating lens element to detect and counter movement so camera shake is eliminated. In practice, it means you can use slower shutter speeds than recommended in Tip 1 while handholding, and still end up with sharp images. Canon lenses use IS (Image Stabilisation) while Nikon lenses use VR (Vibration Reduction). The degree of correction varies but is usually up to four stops. That means if you needed to shoot at 1/250sec without image stabilisation to get a sharp handheld image, with IS you could shoot at just 1/15sec and achieve the same level of sharpness. If you have lenses with IS, conduct some tests to see how effective the stabilisation is – it can make handholding much more reliable, even in low light when shutter speeds start to get really slow.