Double square brackets for surface laptop hotkey

I am very much a beginner in these sorts of things. I have a surface laptop (Microsoft) and I don’t know even basic things about taking notes. e.g. my hashtag is in number 3 on my keyboard, but I don’t know how to use it. More importantly how to type double square brackets with one click or hotkey. Could you please refer me to any source that teach such thing esp for hashtag and double square issue for the surface keyboard?

Thanks in advance

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shift-3 to get #
the [ and ] is above the enter button on the left