A resource showing the use of "that/which", apostrophes, "minimal-minimum/optimal-optimum", "therefore/as such", defining and non defining relative clauses, "Em/En dashes",  and an ESL teachers perspective on styles. The Aus. gov. manual covers many things such as colons and punctuation marks etc. It also shows when to use capitals in directions such as south etc. The grammar and English usage is universally based on the English language.