block quotes and quotation marks

Help

I need a good example and explanation of block quotes (only I don't think I'm using the right word because google is being useless).

You know when you are quoting a massive amount of text, like more than two sentences?  And you put them so that they are indented on both sides and easy to see that they are different from normal text.  

The questions:
When do we use quotes around these?
When do we not use quotes around these?
what is the punctuation for removing bits from the quote?  (ie, does the three dots go inside square brackets?)

it is block quotes indeed!
according to APA style, you use it for 40 words of more of text, and by using a block quote (indented paragraph) you do not use any quotes.
In MLA style, you do not need brackets for ellipsis, but use square brackets to introduce text that wasn't in the original.
(from site cited below)

Adding or omitting words in quotations
If you add a word or words in a quotation, you should put brackets around the words to indicate that they are not part of the original text.
Jan Harold Brunvand, in an essay on urban legends, states, "some individuals [who retell urban legends] make a point of learning every rumor or tale" (78).

If you omit a word or words from a quotation, you should indicate the deleted word or words by using ellipsis marks, which are three periods ( . . . ) preceded and followed by a space. For example:
In an essay on urban legends, Jan Harold Brunvand notes that "some individuals make a point of learning every recent rumor or tale . . . and in a short time a lively exchange of details occurs" (78).

Please note that brackets are not needed around ellipses unless adding brackets would clarify your use of ellipses.

from https://owl.purdue.edu/owl/research_and_citation/mla_style/mla_formatting_and_style_guide/mla_formatting_quotations.html