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Department of Defense
Do Dea: Capitalization Rules and Examples
Learn the proper rules for capitalization with this slideshow. Links for further practice are included at the end.
Harvard University
Harvard Writing Center: Tips on Grammar, Punctuation and Style
Rather than lists of rules, this site provides practical advice on the use of commas, semicolons, dashes, hyphens, abbreviations, acronyms, split infinitives, "this," "that," italics, and underlining. CCSS.ELA-Literacy.CCRA.L.2
Other
Grammar Monster: What Are Common Nouns? (With Examples)
Get a better understanding of nouns with definitions and examples of common nouns, examples of common and proper nouns, noun capitalization rules, common noun categories, and a video [5:21] on common and proper nouns.