I need to better understand how reverse proxy works in NGINX

Lets say I am using ubuntu as my base OS, I install NGINX and NGINX Manager. I would like to use Lets Encrypt and have it automatically renew my SSL cert.

I am currently running it from my home, not in the cloud at the moment.

How can I set it up so that I can connect external sites (Say my digital ocean container) using this reverse proxy?

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