@smurfmier1985 Automatic LODs are something that Unity is working on. It’s been a while since I’ve looked into the LOD system Unity has so I can’t really say whether or not this is already included in the latest versions but I don’t believe it is. Creating a system like that isn’t something I’d teach as it’s a pretty technical process. There are tools available currently that can provide that: https://assetstore.unity.com/packages/tools/modeling/automatic-lod-43652
For rendering only what the camera sees, this is known as frustum culling and is already done by default in Unity. I wrote about the different culling systems used with the camera in this article: https://blog.cgcookie.com/maximizing-your-unity-games-performance/ . Take a look at #5 within the list and you’ll see an example of it. Here is the gif from there:

I haven’t covered occlusion culling in a tutorial but it’s fairly simple to go over. I can probably post a small video on it or create a post here on how to do it.
As far as working with prefabs, you can do the same thing in Unity. If you click on the prefab in the project panel you can opt to work on it in a separate window, or if you have it in your scene you can make changes it to directly from there. Bigger changes like removing a part of the prefab will require you to “unpack” the prefab by right clicking on it to unpack it then make your changes from there. The prefab system has been improved quite a bit lately and can also include nested prefabs which is a big deal.