The simplest way to print documents over Wi-Fi is to connect a wireless printer to the network. Many new printers come with this functionality. Once connected to the network, a wireless-enabled printer can be used by any computer that is connected to the same network. Consult the printer's user manual for specifics of how to connect it to Wi-Fi.
Some printers, especially those intended for use in offices, may feature wired Internet connections. These work almost exactly the same as their wireless counterparts but must be directly connected to the network using an Ethernet cable.
Another option for printing over Wi-Fi is to share a printer on the local network. This method can be used even with printers that lack direct Internet connectivity. The easiest way to set this up in Windows 7, 8 or 10 is to create a Homegroup.
Navigate to the Control Panel, select Homegroup and select Setup. Make sure to check printers when choosing what to share. After this, any other computer on the network may join the Homegroup by navigating to the same page and clicking Join Now.
Google Cloud Print allows similar sharing of printers but can be accessed from any device on any network. To enable this, open Google Chrome, navigate to Settings then Advanced Settings. From there, click Manage under Google Cloud Print. Click Add Printer, and select the desired printer. Then, using any device connected to the same Google account, choose the Google Cloud Print option when printing any document.