Firstly, it would be best if one were aware of the basic rules of grammar. The difference between formal writing and informal writing is crucial. Secondly, one needs to know the difference between American English and British English. For example: colour (British English) color (American English) Eg: specialiSe or specialiZe; through or thru; center or centre; program or programme. etc. There is a distinct difference between those two types of English and what most people do