Found a tutorial although it may not necessarily be for beginners. TL;DR use the simulation replication method to reduce server lag.
But yeah your quote:
Rings pretty true about help for beginners. Even the author of the community tutorial said it himself.
The only reason I found myself was by searching the dev forums especially for issues with motor6D replication and the tips they gave out to not send full CFrame data and smaller vector values to calculate the replication.
I guess it’s because the client to server networking/net coding and stuff like client replication is a pretty advanced topic and that Roblox does already handle some aspects of it in the background:
Example in the post context: Me setting the constraints motors of a vehicle to move forward locally but it also automatically replicates on the server.
Overall, yeah this stuff is not really for beginners and is usually found by google searching and picking the pieces together as you become more advanced as a developer. IDK if this should change but seems like it’s this way for now.