As a complete amateur, I now have a very good broadband home wired network, sharing a cable modem.
You can buy from click here etc plugs, cables, essential plug crimping tool, etc for home wired network. I also found useful a 10mm x 300mm masonry drill.
But you need to know how to wire up the plugs, see:
very helpful articles.
Is it right that wired networks are faster and more dependable than wireless?