Hi Sahil, thanks for your overwhelming response, and good questions. Here are the answers to them- You need to upload the app via Appcenter once, only after that you can use codepush command. You can push only javascript code via codepush, if you make any native changes or install a new library, that can't be pushed via codepush. For such changes, you need to upload the app via Appcenter again.

Thanks Monish!