Cell Phone Charging

When I was in High School I took a  Electric class.
There was a 6Volt Battery , some assorted length wires with battery clips on
each end and some homemade Resistors with wire wrapped around a strip of
Bakelite.
The Teacher gave us Schematics showing Series,circuit to calculate the Voltage
and Current we should get when we assembled the circuit and then used a VOM to
see the readings on the circuit.

We were told to ALWAYS wire the circuit up first , connect the VOM and then put
the battery clips on the battery.

When I charge my ell phone I put the USB C plug in the jack on the phone and
then plug the other end in the A.C. socket.

When it is charged up I unplug the A.C.  plug from the socket and remove the
USB C plug from the phone

I know it is only 5 Volts but I do it that way.

Most folks I see unplug the wire from their phone first , then unplug the A.C.
end.

Probably doesn't matter, but I'm set in my ways
Ed