The style guidelines deal with writing clearly, logically, effectively, and in a way appropriate to the genre and type of text.
The vocabulary guidelines deal with words and other lexical items that you should know and be able to use in your writing. Some guidelines help to differentiate two words that are often confused by learners.
The orthography guidelines deal with spelling and punctuation in English, and other aspects of the encoding of the language using symbols.
The grammar guidelines deal with what we might call “correct and incorrect English”, that is, actual grammatical errors in learners’ writing. Those given here are specially targeted toward Swedish students’ problems.