0.Prerequisites

1. Install Xcode Command Line Tools

xcode-select --install

2. Install Homebrew

Run in terminal:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

If you don't have VPN access or the installation is too slow, you can use a Chinese mirror. Recommended:
/bin/zsh -c "$(curl -fsSL https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh)"