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Development Tools

Setting up bash profile for React Native

I need help understanding what I need to do to the bash profile or bashrc in order to run React Native. Why do I have to set a PATH? How do I set a PATH ? And when do I set a path? The app was working fine, but now I am getting the error: -bash: react-native: command not found.

I believe this has something to do with a PATH not being set properly. Please help.