Grammer question?

Questions in English grammar

A statement is a sentence that tells you something. A question is a sentence that asks you something.

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There are three basic question types:

Yes/No: the answer is "yes or no"

Question-word: the answer is "information"

Choice: the answer is "in the question"

context matters.  normally, none of them.  However, if I were discussing the subject "Scientific Research Methods" specifically in some sort of report, I would likely capitalize all. If I were discussing the subject "Scientific Research" and one part was about methods, then I would only capitalize the first two words.  What is the "name" that you are using here that you want to be seen (defined informally for the purpose of your text) as a proper noun set?

It is possible, even, that the only word you would want to capitalize would be "Research".  In most circumstances, I would not capitalize any of the words. They are not proper nouns unless you make them as such as part of the particular text.  You can (informally) define the term as a proper name if you want, but it would only apply for the duration of the text and any associated discussion.

The one that goes first.

Note spelling - grammar.

None of those words should be capitalised, unless they form the names of a service etc.

The word is spelled "grammar," and this is not a grammar question. It's a question about orthography, which is not grammar.

None of them, unless they are a title.

Grammar........