@Strongsilence-CPA   Tethering is just turning your phone into a WiFi transmitter, as well as receiver.  I knew it existed, but had not used it before.  Look under the Settings for "Mobile Hotspot," at least on an Android.  They warn you that it uses battery charge fast, so keep the phone charging if possible.  I found that my battery dropped from 94% to about 90%, in 15 or 20 minutes.  

My phone connects to the Internet with the Verizon 5G signal.  If my office computer loses its AT&T 5G signal, I can "tether" it to my phone instead.  Do you know how to run an Ookla speed test?  It's easy. When I am using my cable connection, the speed on my office computer comes out to something like 200 whatevers.  (Mbps?).  But that's just from the WiFi signal from the cable modem, because I haven't connected the new box to the cable cord yet.  At home, using the Verizon 5G Home Internet service, I get about 260.  At the office, tethering the Verizon phone to the desktop, I get about 30, which is fast enough while waiting for the regular service to return.  

I think my new office computer is the first one I have owned, that can pick up a WiFi signal.  It can also send one, to one or more printers.  I still rely on cords, to get items to printers, but maybe I should work on that skill.  

Where else would you use tethering?  The first time it was offered to me, I was on a flight to Asia.  This was 12 or 15 years ago.  At the time, WiFi cost more on flights.  Often, it still does.  I could live without it.  Anyway, my seatmate (cute young thing) offered to let me tether to hers.  Being security conscious, and planning on sleeping through most of the flight, I declined.