Type black leather jacket in TEXT
Type white-shirt.jpg in IMAGE NAME
Type anything in TEXT and you'll see the uppercase text in UPPERCASE, lowercase text in LOWERCASE, capitalized text in CAPITALIZED, length of the text, DELIMITER-delimited string followed by EXTENSION in IMAGE NAME, proper URL path in PAGE NAME.
Type the name of a blog post you are writing in TEXT and you'll get the capitalized version, which you can use as the blog's Title. You can use PAGE NAME for the URL path of that post for SEO. You can use IMAGE NAME for an image for that post for SEO. All other fields are for auxiliary information.