debian 10 how to install the wifi adapter driver

sudo apt-get install lshw

3. lshw -c network
then it should list the network adapter on your system
if you can find your wifi adapter is listed, then go on next step,
if not listed, check if the wifi button or switch on your laptop is on.
4. important:
go to system settings: software & updates, debian software： 
downloadable from the internet: enable non-free options
or all the opiton.
4. my wifi is intel 2100 so then run the following command line:

sudo apt-get install -y firmware-ipw2x00 wireless-tools