Something I just don't get [Docker]

Hey all,

Let's say I was given an app built with Flask and React (The is a great example for one).
Assuming I have NO prior experience with building React applications, how should I approach this when building the image?
I was trying to use Google but encountered so many different approaches and I only got more confused..

I guess my question is, when someone is giving you an app written in a framework you have no experience with, and asking you to dockerize it what is your approach? how do you learn how to do it in the best way possible?

Thanks!

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