Capitalization means writing upper case letters, as opposed to lower case letters. While most Internet citizens know that it is considered bad form to WRITE IN ALL CAPS, (it is considered a virtual version of yelling) other capitalization rules can become more confusing.
For example, you may wonder whether "internet" should even be capitalized at all, and if so… when. Fortunately, YourDictionary is here to answer all sorts of key capitalization questions, from Rules for Capitalizing Proper Nouns to Rules for Capitalization in Titles.
For a more general-purpose review of capitalization, learn the 10 Rules of Capitalization. Regardless of your capitalization questions, YourDictionary has the answers here. Now check them out AND DON'T MAKE US YELL!