System Requirements

• Operating Systems: macOS (64-bit)
• Disk Space: 700 MB (does not include disk space for IDE/tools).
• Tools: Flutter depends on these command-line tools being available in your environment.

Step 1 : Download Flutter SDK from official website  https://flutter.dev/docs/get-started/install/macos and Extract the file in the desired location

Step 2: Open .bashrc and add paths which required for flutter 

To edit .bashrc file write below command

nano .bashrc

Now, Add below paths to .bashrc file

export PATH=$PATH:[FLUTTER_DIRECTORY_PATH]/bin
export PATH=$PATH:[ANDROID_SDK_PATH]/platforms
export PATH=$PATH:[ANDROID_SDK_PATH]/platform-tools
export PATH=$PATH:[ANDROID_SDK_PATH]/tools

Step 3: Run .bashrc file with below command

source .bashrc

Step 3: Run below command to check flutter installation in terminal 

flutter doctor -v

It will show all the details regarding flutter installation.