Use the concepts of three point lighting-
First is the Key light
- It usually is quite bright light, facing the subject at certain angle (Basically to lit the subject from one angle)
Second is Fill light
- To lite the subject from another side/Angle(To fill the Dark shadows created by the Key light).
Third Rim Light
- A VERY Bright light from the back of the subject to create an outline of Brightness on the subject also it helps to highlight the shape of the Subject .
Now you have a basic 3 Point Light Setup.
Now you can use your Imagination and creativity to explore the lighting setup by changing the Intensity or Colors and the Size of the Lights also additionally, if you are trying to lit a subject/object and not a scene in particular; Then create a Backdrop or just a ground plane to have a nice bounced light on your subject. Also please consider the Size of your lights while lighting your scene as the Size of the light will affect the way the shadows are being cast and also it can change the look and mood of your subject or Scene."
Please, refer to this tutorial. This can be a good help for you for lighting in blender.