I have looked around at several websites for networked printing and cannot state that any are particularly better than the others. I tend to cherry pick from them all.
Actually if your network works well I would leave alone. Why try to fix something which ain't broke? I have 2 networks. One works well and the other not so well. There is different routers and adaptors being used in the different locations which may be part of the problem but it could well be down to siting of the wireless router.
For a wired network I would go all ethernet and drop the laptop USB connection. Personal preference here without any real eveidence why.
That the Router only has one Ethernet socket, as does the PC.
Is there such a thing as a "Splitter" or would I need a Router with 2 Ports.
As you say "Why try to fix something which ain't broke?" I agree.
However there are so many things about Networking that I don't appear to know.
For example: I assumed that with 2 PCs networked together you could work on the files on either HDD. However this is not the case. It appears that you have to place the file in the Shared Folder for it to be visible on the other PC. I have not been able to discover whether you remove a Document from the PC's shared folder to work on and then put in back in you Laptop's Shared Folder for updating. The Shared Folder do not appear to update the original file. And a thousand more unknowns.
I am not an expert on networking far from it and as many people learn from my mistakes.
You are correct about the shared folder. Place the document you want to work on in the shared folder and leave it there (not a copy but the original). On the other computer work on that document from the host PC's shared folder and it will update.