Visualization is a very import part of data science. Andrew Abela posted a way for how to choose a good chart to help visualize data.
Here are some summaries:
use Bar Chart, horizontal for small variables, vertical for more variables.
For trending information:
use Line Chart, but do no use for categorical data.
bank to 45 degree.
avoid 3D scatter plots.
Pie Chart, Donut Chart or Stacked Bar Chart.
Histograms or Density Plots for single variable.
Heat map for 2D data.