Guitar Lessons In 5 Minutes' Time or Less: #5 TUNING YOUR GUITAR.  
I play each string a few times for you to check yours, show you how to find the correct tuning peg & adjust It.  I also tell you the letter names for each string,which Is Important If you're using an electronic tuner.  If your guitar Is WAY out of tune, the tuner may recognize the wrong letter name & have you tune that string to a note different from the standard one; so It's good to know the letter name of each string for standard tuning.  https://rumble.com/v1cqah9-guitar-lessons-in-5-min.-or-less-5-tuning.html
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