Unity 2018.3 Multiplayer Recommendation

I am building a prototype which is to be done within Jun 2019. Then I have longer term roadmap to build on it in a blog. But that blog does not give the how-to instructions. Nor I have seen any video tutorial.

As I tried multiplayer, I noticed that using ‘Network Manager’ causes deprecation warning. I have seen the timeline of next functionality.
But is there any tutorial or recommended manual ?

Thanks a lot !

I’ve got the same issue. Did you find any solutions?
I think worth writing own multiplayer.