'Do' is used for 'yes-no' questions ( Do you smoke? Don't you know him? ) and for questions in which the '5W' word is the verb object ( How many people do you know here?
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Linian_U"How many people visit your website?"No, because there is no inversion of subject and verb when questioning the subject. Forms of do are only required with subject-verb inversion.
The question of Pres. Ind. tense should have "do"