Tuning your guitar can be as simple as tuning to a single pitch (usually using the A string) and relatively tuning your guitar from that note, right through to tuning each string to it’s desired pitch.
If you primarily have your guitar hooked up to your computer for practice and your chosen piece of software doesn’t come with a tuner (for whatever reason) then you should check out these free online guitar tuners, which often do more than the label says.
