To take good photos in manual mode with your DSLR camera you need to master the knowledge of these three features of your camera, lens aperture, shutter speed and ISO, so you will always get the good result you want in your photo.
These three characteristics have positive or negative effects, it is up to you to understand how each one works, its advantages and disadvantages, and combine their setup to get the photo you want to create and maka the most creative photo.
Lens Aperture
The opening of the lens will let in the light to the sensor while the picture is shot. To this opening is assigned a value of "f". A smaller value of f means the opening is bigger, higher value of f means a smaller aperture. When the lens aperture is larger (small f value) more light enters to take the picture, and when the opening is smaller (big f value) less light enters, this will affect the outcome of the photograph in relation to light. Also this way you can get different depths of field, because able to limit the distance focused the element you want to be focused. If you are taking a picture of a person with a small value of f (big aperture), you will have the face of the person focused and everything in backward or forward of that point will be very blurry, but if you take the same picture with a value of f big (small aperture) the result is that there is a person's face focused but the background of the person will not be so blurry.
Shutter Speed
The shutter is a mechanical device that opens and closes to let in the light that is recorded by the sensor. The shutter speed is the time that the mechanism remain open to collect the light. This time can range from milliseconds, seconds, or even many seconds, everything depends on the amount of light you want to absorb or the effect you want to create. If the speed is too low, and low light enters and your picture gets darker, if the speed is a few seconds, lots of light enters and your picture will be you a lot of light, it also depending on the amount of light where you are shooting. Also taking a picture with a high speed of a moving element, the photo will have motion blur (drag) of the element that moves, but if the speed is too low (very fast), you can freeze a picture of that same element in motion, even if the element moves at high speed. When the speed is high (even smaller than think ) you should use a tripod to get this picture, because the slightest movement of the machine can reuin the whole picture.
ISO
ISO is the light sensitivity to the image. A small ISO will create a picture darker, while a higher ISO will create a clearer picture. Usually a low ISO value will be ideal for your photographs, a high value can create noise/grain to your image. But sometimes you may need some high ISO values to increase the brightness of your photo and other details.
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