Tabs4Acoustic.com and ResoundSchool.com are two sites that offer valuable instructions on reading guitar chord charts. Both sites show diagrams of chords and explain what each symbol means. Tabs4Acoustic shows a diagram of a hand to illustrate how the numbered dots on the chord relate to different fingers.
Visit Tabs4Acoustic.com, select Guitar Lessons, and choose How to Read And Play Chords For Beginners, whch is located under Top Guitar Lessons. Alternatively, visit ResoundSchool.com, click on Resources on the home page, and select Chord Charts. Within the page titled Chord Charts, navigate to an underlined link titled Read This Article, which enables you to open a page headed How To Read Chord Charts. ResoundSchool's chord diagram explanation chart is also available as a downloadable PDF file.