How do you achieve unity and coherence in paragraph writing?

Supervisors: this is part of a learning hub on how to write effective paragraphs. Please do not delete answers or alternate questions.

Unity means that the whole paragraph should be about one topic or subject.

Coherence means that the paragraph should be easy to read and easy to follow; you can achieve this by using word bridges ("therefore," "such as," "for example,"this means that," and so on).

Read any of the "Learning Hub" answers in Creative Writing and Learning Tips and you will see that each paragraph has unity and coherence.

Here is what one Wiki Contributor has to say:

If one is looking for unity of paragraphs, it is important to find that common denominator between the paragraphs that will unite them. It is also good to have some sort of rallying cry or catchy slogan that will inspire unity amongst the paragraphs. All paragraphs are not united in the same goals and it is important to understand that if you are attempting to unite the paragraphs towards a common cause, you won't have much luck getting the capitalist's paragraphs to join the communist party of paragraphs no matter how clever or catchy your slogan might be. If you want to achieve unity of paragraphs it is best to unite those paragraphs that can get along and work well with each other, as they will be stuck with each other for some time once written down for posterity.

Now, coherence is another matter and if one is attempting to achieve some sort of coherence in the paragraph writing, there is no need to worry about what is known or the knowledge necessary to make an argument in order to achieve coherence in your writing of paragraphs. You don't need to know what your writing about in order to achieve a coherence between paragraphs.