Luis can't connect to his Wi-Fi at his house, but he can connect to other Wi-Fi networks. Leo says that the first thing to do is connect via ethernet, just to make sure he can connect wired. Then he should try and join the Wi-Fi while he's right next to the router. If he can't connect, he should try rebooting the router. Then reboot the laptop. Then try wired again. It could be a handshake issue.