When you are surviving in the wilderness, traps and snares are essential for providing much needed protein. What makes traps and snares so important is that they are a passive hunting technique. That means you set them up (the more the better) and they work in your absence, so you can be busy doing other essential tasks whilst the traps and snares are working for you.
Active hunting and fishing is also vital, with potentially greater rewards, but a much greater drain to your time. You should aim to use a combination of both active and passive hunting techniques to increase your chances of success.
If you hope to survive for a time in the wilderness, you should learn how to create and set several different traps and snares. This video shows how to build, set and trigger a t-bar snare. There is also advice on where to place the snare for maximum effectiveness.