Here are the first steps to try:
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Make sure Wi-Fi is turned on for your device (including any physical Wi-Fi switch, which usually has an indicator light to show when it's turned on).
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Select the Internet status icon on the right side of the taskbar, and make sure the Wi-Fi tile is turned on (as indicated in the image below). If it isn't, select the tile to turn it on. Similarly, make sure Airplane mode tile is turned off (as indicated in the image below).