writing and spaces
1. There is no space between a name and 씨
2. Words are separated by spaces. A "word" is anything in the Korean-Korean dictionary. Kind of a circular definition, I know.
3. Leave a space between parts of speech Noun + verb (one space) noun + adverb + verb (two spaces)
4. there is no space between particles (이, 는, 를, etc.) and verb endings (어미)
e.g. 나는 너는 공을 치다 (to strike a ball) 공을 차다 (to kick a ball)