Answers to questions:
1) Correct.
2) and 3) see below:
The Infinitive most often replaces the Imperative Mood in the cases of impersonal commands to an unknown audience, as in warnings, instruction manuals, recipes and official notices. It is used in place of the vous form of the imperative.
Ne pas se pencher au dehors. Do not lean out.
S’adresser au concierge/chauffeur. Apply to the porter/driver.
Mélanger les épices avec de l’eau. Mix the spices with some water.
See here
https://www.thoughtco.com/commands-in-french-1368854
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