There are 3 settings that will affect exposure. Shutter Speed, Lens Aperture and ISO. Learn how to combine the 3 for the effect you want to achieve.
The Exposure Triangle
The exposure triangle is a common way of associating the three variables that determine the exposure of a photograph: aperture, shutter speed, and ISO
How do they work together
All 3 settings impact on one another, so once you change one there is knock on effect for the other two. A change in one will require an adjustment of at least one of the others.
They are different !
Good is exposure is key but using the 3 elements of the exposure triangle can give the same 'Exposure' but also give the image a different 'Appearance'.
Shutter Aperture ISO
In Manual mode you make decisions about settings you need, learn how to control each one to get the effect you want by understanding the exposure triangle.
Move forward with knowledge
Once mastered you can will make better creative decisions about shutter, aperture and ISO and how your final image will look.
EV - Exposure values
Learn about 'Stops'
Combinations of Shutter Speed, Aperture and ISO are called Exposure Values, EV. Changes in EV will half or double the light reaching the sensor. Understand how to Select your EV.
Tools & Resources
Learn about ISO
The ISO (film speed / chip sensitivity) has many effects, increasing ISO allows you to work with less light but will increase noise. I will help you understand when and why to change ISO settings