If you are in the 'developed' world (UK, Europe, USA) then there is no other way to effectively deal stocks ..
Paper Share Certificates no longer exist and (your Teacher should know this) ALL trading is done 'on-line' ..
Some 'traditional' traders still like to ring up their 'broker', however, unless you are blind (and thus unable to use a PC) or a millionaire (and don't have the time) it's totally pointless, since all your 'broker' is going to do is log on and perform the exact same trade you could have done yourself (expect he will charge you a higher rate of commission than you get by doing your own typing) ...