I am looking for an app so I can tether my canon rebel t6i to my laptop for the purpose of just being able to view the photos I take, as I take them, but on a bigger screen. Also, are there changes I will need to make on my camera or my laptop and since I am in the process of purchasing a new laptop, do you have any recommendations knowing I will be using it mainly for tethering, editing photos, and photo storage etc?
Canon has a software program for your computer called "EOS Utility" that will do everything you want and more. There are no changes required to the camera or computer.
It comes on the CD with your camera or can be downloaded from Canon. Look for "software" under "Drivers and Downloads": EOS Utility Download