Cuemath
Cuemath: What Is Bar Graph?
A comprehensive guide for learning all about bar graphs with definitions, how to use a bar graph maker, simulations, and practice questions.
Colorado State University
Colorado State Writing Center: Charts
The use of charts and graphs can improve your presentations, whether on paper or as visual aids. Here you can read about how to create line, column, bar, pie graphs, and scatterplots. Just follow the links to their respective pages.