I have smart devices (light bulb and smart plug) but it doesn't want to connect to my internet ...

I have a smart plug that lost connection after a power outage.  I tried everything to get it to pair but nothing worked.  One day, my eyes landed on a T-Link wifi booster I have plugged into the wall in another room.  I noticed that it's lights were not displaying normally.  I pulled that device out of the wall and then plugged it back in to reboot it.  Then I went back to the smart plug and it paired without a problem.