Troubleshooting

Wifi

Your ~/etc/wpa_supplicant/wpa_supplicant.conf should look something like this:

country=US
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
    ssid="your network name"
    psk="your password"
}

However, there are times when the Pi has an IP but can't connect from host

If you can't ping the RPi from the host, then simply try the opposite: ping the host FROM the RPi!

There are various commands, over and above the humble ping to probe the network:

Linux hostname command

hostname -I

-I, --all-ip-addresses

sudo nano /etc/hostname

Display all network addresses of the host. This option enumerates all configured addresses on all network interfaces. The loopback interface and IPv6 link-local addresses are omitted. Contrary to option -i, this option does not depend on name resolution. Do not make any assumptions about the order of the output.