Here’s some valuable information for authors: the difference between capital and capitol.

Capital has a number of definitions, but the one most confused with capitol is when referring to a city that is a governmental or administrative center, as in The capital of Georgia is Atlanta. It also can refer to a city of prominence in some industry or field, as in Detroit is the capital of the auto industry.

Capitol refers to the building where the governing legislature meets, such as The California Assembly was in session at the capitol today.

By memorizing this difference, you now should have good regulation of your writing.