If your wifi connection is not stable or always disconnecting, what solve the issue for me also was getting a usb wireless adapter for my Macbook. I highly recommend:

USB Dongle for MAC
https://amzn.to/2OIQ2CQ

Best Home Router for your Macbook – TP-Link AX1500
https://amzn.to/3jY6fSa

In this video I will show you how to do more than basic troubleshooting when it comes to wireless issues on your MacBook Pro, iMac, MacBook Air.

It is sometimes annoying to have to deal with wifi issues so I decided to make this video to help you fix your own issues.

In this video I am using my iMac running OSX El Capitan.

If you follow all of the steps I show and you continue to have issues connecting to wifi on your MacBook Pro, MacBook Air, iMac or Mac Mini, send me a message.

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Please take the opportunity to connect and share this video with your friends and family if you find it useful.