Export Android Variables to the system

bash_profile

//MacOS Catalina and After or Linux that work with zsh shell

  //Create the file
  Start up Terminal
  Type "cd ~/" to go to your home folder
  Type "touch .zprofile" to create your new file.
  Edit .zprofile with your favorite editor or with "vi .zprofile" to open it with VIM

  //Put this on the .bash_profile file
  export ANDROID_HOME=~/Library/Android/sdk/
  export PATH=$PATH:$ANDROID_HOME/platform-tools
  
  //Save

  //Execute the file on the terminal
  source .zprofile

//MacOS before Catalina or linux that work with bash (.sh)

  //Create the file
  Start up Terminal
  Type "cd ~/" to go to your home folder
  Type "touch .bash_profile" to create your new file.
  Edit .bash_profile with your favorite editor or with "vi .bash_profile" to open it with VIM

  //Put this on the .bash_profile file
  export ANDROID_HOME=~/Library/Android/sdk/
  export PATH=$PATH:$ANDROID_HOME/platform-tools
  
  //Save

  //Execute the file on the terminal
  source .bash_profile