The meanings can overlap.
To "quote" is to repeat someone else's words, in a way that indicates that you are repeating someone else's words, as opposed to incorporating them into your own work without any explicit identification that they are copied. (This could be plagiarism or it could be an allusion, but that's a different issue.)
To "cite" is to reference some other work. You may be quoting it word-for-word or you may simply be referring to it. "Cite" can be used to mean "quote", but it would rarely be used if you gave a quote without a reference, and it can be used when you give a reference without a quote.
Examples: "As Winston Churchill said, 'I have nothing to offer but blood, toil, tears, and sweat.'" This is unquestionably a quote. It might be called a citation.
"According to Barclay's Famous Quotations, Winston Churchill once said, 'I have nothing to offer but blood, toil, tears, and sweat." This is both a quote and a citation.
"In his History of Britain, Charles Stover says that Churchill called on the British people to be willing to make sacrifices." This is a citation but not a quote. It is not a quote because we are not repeating any exact words.
And to be complete: If I wrote a novel, and at some point in the novel I write, "General Framnitz urged his soldiers to fight on. 'I have nothing to offer but blood, toil, tears, and the billions of dollars of loot that we will get when we take the city'", that would be an allusion and not a quote, because I am not making any clear reference to Mr Churchill, and because I'm adapting the quote for my own purposes.
A citation can be informal like my examples here, "As he said in ...", or it could be a more formal reference, like "See Stover, Charles. History of Britain. Fwacbar Publishing, 1964, pp 85-86" (The exact formatting varying depending on what style guide you're using, if any.)
They are separate words.
Something reoccurs if it happens more than once.
Something recurs if it happens more than once and at a regular interval. A good example would be your electricity bill – most people pay monthly or every quarter, and so they have a monthly-recurring or quarterly-recurring bill.
Compare these dictionary definitions (from Oxford Dictionaries):
reoccur
[NO OBJECT]
Occur again or repeatedly:
"ulcers tend to reoccur after treatment has stopped"
recur
[NO OBJECT]
Occur again periodically or repeatedly:
"when the symptoms recurred, the doctor diagnosed something different"
(as adjective recurring) "a recurring theme"
As you can see from the definitions, there is some overlap. In general conversation I would not be surprised to hear recur and reoccur used interchangeably. In formal or professional correspondence (like a bill), however, I would expect the words to be used as described in the first part of my answer.
Best Answer
Technically, best means nothing is better, whereas top can just mean something like in the upper 10% or beyond a certain threshold.
In reality both of these are marketing terms used for their sound and the exact meaning usually doesn't matter. For example, check out the Wikipedia article on bestseller.