There are several options for installing Git on macOS. Note that any non-source distributions are provided by third parties, and may not be up to date with the latest source release.
Homebrew
Install homebrew if you don't already have it, then:$ brew install git
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Xcode
Apple ships a binary package of Git with Xcode.
Binary installer
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Tim Harper provides an installer for Git. The latest version is 2.27.0, which was released 3 months ago, on 2020-07-22.
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Building from Source
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If you prefer to build from source, you can find tarballs on kernel.org. The latest version is 2.29.1.