Coherence 5 and 6

I have to say that I don't quite understand the whole articles, but I know that the author gave some principles as follow:

The author of the articles-Williams offers some principle that will help writers realize when your readers might think that your writing is incoherent.

Principle 1: Readers will feel that a paragraph is cohesive if it has consistent topic strings. (p.82)
Principle 2: A reader will feel that a paragraph is cohesive if it has other strings of related words. (p.83)
Principle 3: A reader will feel that a paragraph is cohesive if he is introduced to new topic at the end of the sentence. (p.87)
Princeple 4: A reader will feel that a paragraph is coherence if they can read a sentence thtat organize its point. (p.97)
Principle 5: A reader will feel that a paragraph is coherent if they find the point sentence at the end of its issue or at the end of the paragraph. (p.99)