How to set my SLR parameters for portrait photography?

1, indoor lighting portrait, aperture 8 or 1 1, shutter 125 or 250, sensitivity 100.

2, outdoor natural light portraits (mainly people, need to add reflectors, etc. Shoot with a medium telephoto lens. ), the aperture is above 4, and the background is blurred. The shutter is above 250 to ensure the clarity of the hand shot, and the sensitivity is not more than 800 to ensure the picture quality.

3, environmental portraits (mainly the state of the characters in the environment, shot with a tripod head or a wide-angle fixed-focus lens. ), the aperture is above 2.8, and the shutter is above 125. Adjust the sensitivity according to the acceptable range.