It can be hard to imagine or remember the days before Wi-Fi, when you had to run Ethernet cables throughout the house to connect computers to the internet and carry files around on CDs and portable hard drives (affectionately known as "sneakernet").
These days, we take Wi-Fi for granted - right up until it stops working and brings our modern connected household to a complete stop.
Fixing computer problems like Wi-Fi connection issues often comes down to the process of elimination. That's why technical support technicians often start by asking silly and obvious questions like "is the computer plugged in?" Once you know the Wi-Fi is running, check to see if the problem happens on just one device or on all of them. If you can't connect on your laptop, for example, check your phone to see if you can see Wi-Fi signal strength bars.
If you see an error message, you might not have a working internet connection; continue troubleshooting in the next section. If you see a reply from Google, then you have a working internet connection and the problem lies elsewhere.