I believe "free" is capitalized because the subject of this post is written in title case, as the title of a book or certain newspaper headlines would be. In title case nouns are capitalized; the word "on" is a preposition and thus left lowercase.
Whether a post's subject should be written in title case is a stylistic choice I have no strong opinion on.
I believe "free" is capitalized because the subject of this post is written in title case, as the title of a book or certain newspaper headlines would be. In title case nouns are capitalized; the word "on" is a preposition and thus left lowercase.
Whether a post's subject should be written in title case is a stylistic choice I have no strong opinion on.