I am trying to look for a tutorial that explains your how to setup user session in redis store using express session. I know how to set it up, but I could not find out how to access redis store and how to store and retrieve values from that redis store?
I'm assuming you want to store and read values from the session (using the express-session module) and not use redis directly. For this you'll want to use the req.session object in a request.
Checkout the functions here in the documentation - https://github.com/expressjs/session#reqsession
If you're trying to store some values directly into redis (perhaps using redis for multiple things) then checkout https://www.npmjs.com/package/redis