Graphs and charts are great because they communicate information visually.
You can create a Bar, Line, Area, Pie using this free online tool at nces.ed.gov.

Tuning a guitar is the single most important concept for a beginning guitarist to learn. At the same time it is often their first stumbling block. If your guitar is not in tune, you will never sound good.

Guitar noise offers lesson which contains instructions for a beginner to tune a 6 string guitar to standard tuning.

[ How to Tune a Guitar ]