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Ditto. I mostly use it when Google (search, not Bard) fails me. I find it’s really good at answering questions of the ilk: “I swear there’s a function for this in the library I’m using, what’s it called again?”, or telling me that it doesn’t actually exist.
If you ask the FSF, open source is a bigger set than free software, mostly to do with restrictions on the uses of the code
https://www.gnu.org/philosophy/categories.html.en