In regards to paragraphs, please remember that the on-topic forums are for posting clear, concise arguments in understandable language; not for posting poetry or riddles. Do not post poetry and do not post in poetry format in the on-topic section of the forum. (Poetry and riddles can be posted in the off-topic section.)
To illustrate, the following would be correct:
The following would be incorrect:This is a sentence. This is a sentence. This is a sentence.
This is a sentence. This is a sentence. This is a sentence.
This is a sentence. This is a sentence. This is a sentence.
The following would also be incorrect because there is only one line break separating the paragraphs:This is a sentence.
This is a sentence.
This is a sentence.
This is a sentence.
This is a sentence.
This is a sentence.
This is a sentence.
This is a sentence.
This is a sentence.
This is a sentence in the first paragraph. This is another sentence in the first paragraph.
This is a sentence in a second paragraph. This is another sentence in the second paragraph.