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1. Install docker and run it. Make sure icon shows in top-right corner of mac
2. Make sure you have npm installed - npm -v
3. Make sure you have nvm installed - nvm -v
4. Make sure you have Node installed - 
5. Make sure you have node version 14.x installed if not 
5.1. nvm install 14  #do not give specific version i.e. 14.17.3 this may raise npm error
6. Go to https://github.com/WordPress/wordpress-develop
6.1. fork it
6.2. git clone it anywhere you like
6.3. open terminal and cd to the cloned directory