What specific properties of actor component do replicate?

We have replication flow described here: Detailed Actor Replication Flow | Unreal Engine Documentation, but what is replication exactly? For example, pawn movement is replicated, but seems like skeletal mesh component properties are not.

Where can I see the list of properties depending on “component replicates”?

I hope this won’t be a question without answer again. I’ve been trying to understand the topic for almost an year and yet still didn’t get any helpful information. There must be a way to simplify the multiplayer pipeline. It’s so frustrating to duplicate replication manually with ton of variables and functions.

Another explanation of the problem: Actor parameters don't replicate? - Programming & Scripting - Unreal Engine Forums

So there is a Tab in the Class Default with Shows the Properties you can set your an actor to be replicated.

For example in a bullet you want to replicate the movement so the bullet flies on all Clients.
The Parameters can be set in the Event, which is replicated but this must be done in a Multicast so everyone gets to know the Parameters and not only the Server.

So the Movement and the Actor Overall replicate but the variables must be set for everyone.

I was asking specifically about actor component properties, not in general. For example, you can’t say to server that you want change the mesh of your bullet with 1 simple checkbox. You have to fuss RPCs and stuff