computer questions. Cookies Firefox

How to use firefox
how to clear the cache
google or firefox
settings in firefox.
allow cookies
had to for wordpress for instance
how to back up data how to set a password Howto be an administrator passwords for admin
How to connect bluetooth to other devices family sharing for computers a good or bad idea.

Where to go to look at code or to insert a code if needed to readjust a programme. Things not to do
Clearing memory
speeding up memory
old files old photos backup issues again ? onto a ubs or hard drive how to do it
how long does it take.