Watch a video about WiFi Connectivity
Check your Internet bandwidth using an online speed test.
Move closer to your router. Being far away and having walls or furniture between you and the router affects the quality of your connection.
Use a 5Ghz network. Check your wifi networks available, chances are that your router is also creating an additional 5Ghz network. Use this one if possible since this networks are less congested than traditional (2.4GHz).
Disable/re-enable WiFi: Turn off your computers WiFi. Wait 15 seconds. Turn it on again.
Restart your router: Unplug it, wait 15 seconds. plug it again.
Get connected via a wired cable (Ethernet) if your internet router has wired ports.
Upgrade your WiFI router firmware. Check your WiFi router vendor support site for firmware upgrade availability.
Use a WiFi extender to increase the distance and strength of your WiFi signal.