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Take the following precautions when you use Live View and Movie modes:

 Light that enters the viewfinder can affect exposure. For this reason, it’s a good idea to cover the viewfinder while you’re shooting. Canon used to supply a viewfinder cover that was stored on the camera strap, but no more. I trust you can figure out a suitable alternative, although my guess is that you won’t experience any issues unless you’re shooting really long exposures.

 Using Live View or Movie mode for an extended period can harm your pictures and the camera. Using the monitor full-time causes the camera’s innards to heat up more than usual, and that extra heat can create the right conditions for noise, a defect that looks like speckles of sand. More critically, the increased temperatures can damage the camera.

 A white thermometer symbol appears on the monitor to warn you when the camera is getting too hot. If you keep shooting and the temperature continues to increase, the symbol turns red and blinks, alerting you that the camera soon will shut off automatically.

 Aiming the lens at the sun or other bright lights also can damage the camera. Of course, you can cause problems doing this even during normal viewfinder shooting, but the possibilities increase when you use Live View and Movie modes.

 Live View and Movie mode put additional strain on the camera battery. Extra juice is needed to power the monitor for extended periods of time. If you do a lot of Live View or movie shooting, you may want to invest in a second battery so you have a spare on hand when the first one runs out of gas.