First to install the azure module in power shell type in
install-module -name az -AllowClobber
now that you have the module installed you can get a list of all the available modules using
get-module az.* -list
this will list out all of the available azure powershell modules
Now if you would like to get all the commands within a particular module you could simply execute the following command
get-command -module az.signalr
get-help new-azsignalr
which would provide you valuable information on how to use the specified command. Notice the remarks section allowing you to get more detailed information as well as examples.
finally to execute any of these command we have to connect to our azure account which we can do by executing
connect-azaccount