Does brew list on Mac only list software installed through homebrew?

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can homebrew only install the latest version of the software?
where is the source of the software, homebrew"s own server?
what"s the difference between downloading and installing the root itself from the official website?

Ruby swift objective-c python java

Mar.10,2021

first question: yes
second question: there is a hint on the official website.
the third question: for example, install java. The environment should be matched under the official website. Brew does not need

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