Why I can’t connect to Wi-Fi Mac?

What happens when you try to connect your Mac with your Wi-Fi router?

Any error messages or diagnostics?

Tried re-booting the Wi-Fi router, and re-booting the Mac?

Tried updating the Mac, and loading the latest firmware for the Wi-Fi router?

Some general troubleshooting suggestions from Apple: If your Mac isn't connecting to the internet over Wi-Fi - Apple Support

Check the range of the mobile network, see this Apple article: If you see No Service or Searching on your iPhone or iPad

If you see No Service or Searching on your iPhone or iPad - Apple Support

Then see the following Apple articles:

Connect to Wi-Fi on your iPhone, iPad, or iPod touch

Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support

Recommended settings for Wi-Fi routers and access points

Recommended settings for Wi-Fi routers and access points - Apple Support

If you need help with your Wi‑Fi password

If you need help with your Wi‑Fi password - Apple Support