People's names and titles
Sergeant Holmes went to Professor Matthews' assistance.
The sergeant helped the professor.
Names of specific places
She came from Mount Washington down the Saco River to Biddeford, Maine.
They couldn't decide whether to go to the mountains or to the lake for their vacation.
Names of inhabitants of specific places
Frenchman, Southerner, New Englander, Ohioan
Days of the week, holidays, and months
Monday, Tuesday, Thanksgiving, Christmas, March, June
Names of specific businesses, institutions, organizations, religious denominations
Both the Democratic Party and the Congregational Church had harsh criticism for the Mandible Corporation.
He went to church every week.
Historical events and eras
From the Victorian Age to the First World War
If you can't decide whether to capitalize a word, sometimes the dictionary can be helpful. For example, the dictionary showed the following words as capitalized:
Test your understanding of capitalization