Where do I obtain the required keys necessary for this mongodb/REACT project

Alright so I found this project relevant to the topic which I was looking for and attempted to get it running.

https://github.com/ujjalacharya/dhan-gaadi

It requires various keys to operate, I seem to have everything else necessary for this project to get running.

MONGO_URI = "path to mongodb url"

userEmail = "your email"

userPass = "your password"

JWT_SECRET = "your secret here"

And it also requires a JWT key for the following field:

REACT_APP_JWT_SECRET = "your secret here"

All I really need is someone to point out or guide the direction to go towards in obtaining these keys.