Why we need classification?
How to classify?
Shape file does not carry styling information. You have to save classification by symbology with styling information into a separate layer file.Traditional classification only happen in styling level, not the data iteself (shape file). This example you will classify the parcel by its size. I want all the parcels less than 5000 square feet and all the parcels less than 6000 sqaure feet. Classification by symbology is good enough for a static paper map. However for interactive arcgis online map, you can do more than that.
For interactive web map (Arcgis online etc.), you can
engrave classfication into data (shape file) itself.
The data ( shape file ) itself will carry classification information as much as you want. You can simply add one column for each classification. In this example, I add size_1 for 5000 square feet and size_2 for 6000 sqaure feet.
Let's look at result on arcgis online scene viewer and map viewer by click
3D Scene viewer right click and hold mouse button, can rotate map in 3D fashion
arcgis online map viewer >>>>> filter
arcgis online map viewer >>>>> styling
Let's look it at google map
All above sample, if you click size_2, you will see another classification by 6000 square feet.
You can keep adding more classification rule by adding more column endlessly.
How to open above example?
You can search "village" on Arcgis online to download related static PDF map
Look at google map, you can