Small Capitals are capital letters that are the size of the lowercase "x" height. They transition more naturally between lowercase and uppercase.
-- Does your font have small caps? If not name a font that does.
My font, Mrs Eaves does have small caps, along with a wide variety of weights.
-- Ligatures? why are they used? when are they not used? what are common ligatures?
Ligatures are two letters that are connected because they would overlap or throw off the the kerning between the other letters. "The Chicago Manual of Style, for example, advises against using them in Latin or Greek transliterated words or in foreign words that have been adopted into English and are thus in an English dictionary. They do, however, recommend using ligatures to maintain Old English spelling in an Old English context or in foreign languages where they are commonly used characters." Common ligatures include the lowercase "f" attached to a letter like "l" or "i".
-- Does your font have ligatures? If not name a font that does.
My font does have ligatures
-- Difference between a foot mark and an apostrophe?
A foot mark does not have the rounded part at the top. It looks more like a vertical dash whereas the apostrophe has a rounded appearance with a circular part at the top.
-- Difference between an inch mark and a quote mark (smart quote)?
This is similar to the difference between a foot mark and an apostrophe. The inch mark is a double prime or vertical dashes whereas the quote mark is two curved lines with circular attachments at the top.
-- Hyphen, en dash and em dashes, what are the differences and when are they used.
An em-dash is typically used to act as a comma or parenthesis to separate out phrases—or even just a word—in a sentence for various reasons. A dash is a longer line—double the length of a hyphen—which indicates a break or an interruption in the thought. Dashes are used to set off part of a sentence.The en dash connects things that are related to each other by distance, as in the May–September issue of a magazine.