Great tips! One I personally use and i'd like to add is zone focusing, where you set a very small aperture (which means the aperture number is large, like f8 or f16) and you set the focus point to a hyper focal so that anything in front of you from about 1-2 meters onwards is completely in focus. that way with some practice, you can take a picture without even looking through the viewfinder or flip screen. I've been able to use this to take a lot of candid street portraits up close to people, it also helps that my camera has a leaf shutter which is virtually silent.