Networking

Is the problem the network or one service?

Start by checking what still works. A PC that can reach websites but not a shared folder has a different problem from one with no connection. Record the affected device, connection type and exact destination before selecting a guide.

Which network guide should I choose first?

Choose Wi-Fi or Ethernet for the connection itself, IP addressing for adapter details, and network shares for folders or mapped drives. Test one layer at a time. Changing several settings together makes it harder to identify which change affected the result.