I started to develop a Unity-based game. I thought it needs networking. But when I try to add any networking component, I couldn't find it. Screenshot:

I heard something about introducing a new system, but what to do now? Is there any analog?
If needed: Unity version 2019.2.Of1
If offtopic
Please, say where to ask it. I would be thankful.
You can use the deprecated UNet by adding it via Package Manager (Window > Package Manager), search for Multiplayer HLAPI and install the package.
Otherwise, you can use the new Open Match thing they are creating, take a look here.
More info on which one you should use here.