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At the end of a sentence, you put a punctuation mark. Without a space between the last letter and the punctuation. After the punctuation mark, you put in a space or a paragraph (hit return twice). Then you start a new sentence (with an uppercase letter).
The same goes with question marks, exclamation marks and commas (although in this case, don't use paragraphs after the comma).
If you are paying attention to these little standards, your postings will become more comprehensible and - for reasons unknown - people will show a different and more respectful attitude towards you in general.