Like a lot of concepts in photography, lighting seems complicated but is actually pretty simple once you have a good grasp of the basics. There are lighting setups that can be used in many different situations, and there are variations and techniques to address any light problem you might encounter.
While you may come across situations as diverse as studio lighting where you can control every photon, to outdoor shoots with harsh overhead sunlight, to night scenes with very little available light, once you understand how lighting works, you'll be able to find a solution. You'll find information on those basic concepts here, as well as useful tips and instructions for very specific situations.
Follow the advice and diagrams here, but never be afraid to experiment. You never know when tweaking the angle or intensity of a single light might make the difference between a good photograph and a great one. And if you're shooting digital, the only thing you'll waste is a bit of time.