Why won’t my MacBook Air connect to WiFi at my house?

I have been having this problem for over a week. My MacBook will connect to WiFi anywhere else except my house. I have AT&T U-Verse as my internet provider and never had a connection problem before. All my other devices connect just fine. (2 iPhones, 2 iPads, and a windows computer) I have the Mac completely updated to high Sierra and I installed the security update and still no luck. Is this a problem with my computer or a problem with my internet? Very strange this is the only device having this problem.