Whether as words in paragraphs, sentences between paragraphs, or paragraphs between sections, transitions help you understand the order of your paper and help your reader to follow along. Either write in first person, thus making yourself the focus of the essay, or use third-person examples. More than one rhetorical question indicates that you the writer have no sense of what to say. These two words must agree in number and gender. Run spell check, and when in doubt look it up.
Commas have so many uses in the English language that they can be difficult.
Read about commas in a good handbook. Pay attention to instructor comments and marking about commas and try to understand and fix them. Edit for commas.