I have obtained some of the data for Sonoma County census tracts that you can use here. Add a table with a portion of the census data for the County to your project. Click Add to bring up the Add Table dialog box. This adds the table into the project in a new window. Observe that this table has many columns of data, which you may be able to recognize.
Columns here give information about population, ethnic groups, education, income, and housing.
Scroll right and left to see these fields. Now that we have these demographic data, we want to create a map of them. For instance, we could shade each tract according to the percentage of college-educated persons in each tract. Questions on this Page 1. Click back if necessary on the Sonstf3.dbf table.