People sometimes ask me to teach them "the language for pie charts" or "the language for tables". I tell them that they already know it. The language for the following 4 types of chart is the same:
- Line graphs
- Bar charts
- Pie charts
These 4 types of chart all show the same thing: numbers. You can usually take the same set of numbers and present them in either of these 4 ways. The language you use to describe them will not change.
So what type of language are you going to use? You need to be able to 1) describe numbers 2) compare different numbers 3) describe changes in numbers (increase, decrease etc.). Easy!