What is punctunction?

Answer 1

I think you mean 'punctuation'.

Which is the correct use of marks around words,

and sentences in the English language.

such marks are full stops(periods), commas, apostrohe, colons, semi-colons, exclamation mark , question mark and speech marks.

Even native English speakers can easily and incorrectly use punctuation marks.

However, as a first simple rule, always use a capital letter to start a sentence and a full stop to end a sentence. e.g. The dog sat on the mat.