I'm creating a website for a language school. It has a small navigation menu:
What is the right practice:
etc.
And should it be capitalized: Elementary?
I think you should probably use English Capitalization Rules.
As what you mention are titles, these rules should apply:
6. Capitalize Most Words in Titles
The capitalization rules for titles of books, movies, and other works vary a little between style guides. In general, you should capitalize the first word, all nouns, all verbs (even short ones, like is), all adjectives, and all proper nouns. That means you should lowercase articles, conjunctions, and prepositions—however, some style guides say to capitalize conjunctions and prepositions that are longer than five letters.
The same goes for punctuation: you should probably use a colon as a construct in your example "Adults: elementary" is a "Title: subtitle" relationship:
To express time, in titles, and as part of other writing conventions. [...]
- With subtitles. Colons are used to separate titles from subtitles. Example: Everest: The Last Frontier
