Go see Greg Wooledge's wiki

Just not all at once, please.

I don't see freenet having those issues though. Node administrators for sure, but not freenet users. Freenet users don't really have keys or even any necessary knowledge of the technical layer of encryption. They need to know how to connect to a node.

You have a misunderstanding. Every freenet user is a node administrator. The freenet node is what actually does all the work. Every user runs a node, and every node has a data store. The node has a web interface on port localhost:8888, to which a browser can connect, so that the user can see the files in freenet in a comfortable and familiar environment.

Beyond that, if the user plans to publish content within freenet, then he must understand the basic freenet concepts of keys, keypairs, hops to live, and so on.