Capital letters are required on named nouns (Proper Nouns). They could be a place, person or company name.
E.g. Manchester United is the name of the football club.
England is the name of a country.
Full stops go at the end of a statement. It is usually an unemotive sentence.
Question marks end a question. Clues that the sentence is a question include ‘how,’ ‘why’, ‘when’, ‘where’ and ‘who’. A ‘?’ is required at the end.
E.g. ‘How are you feeling today?’
Exclamation marks end an emotive statement. They usually show expression of thought. A ‘!’ is required at the end.
__E.g. __‘Come here, now!’ shouted Mum.