Guitar Tuner
This video is useful if you don't have a guitar tuner or app yet....
Use the video above to tune all six strings, one string at a time, starting with the thick E string nearest your head.
Pluck your thick E string and listen carefully.... does it sound higher or lower than the E string on the video?
If it sounds lower than the video - tighten your string until it sounds the same.
If it sounds higher than the video - loosen your string until it sounds the same.
Do this for all six strings.
This will be a great way to train your musical ear too!