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By default, Homebrew will install all packages in the directory /usr/local/Cellar/, and also creates symbolic links at /usr/local/opt/ and /usr/local/bin/ (for executable files).
~ % brew update
Already up-to-date.
~ % brew -v
Homebrew 3.1.12
Homebrew/homebrew-core (git revision 830670cf82; last commit 2021-06-20)
~ % ls -lsa /usr/local/Cellar/
~ % ls -lsa /usr/local/opt/
~ % ls -lsa /usr/local/bin/
~ % brew info maven