Which mississugha neighbourhood is closer to Toronto for everyday commute from mississugha to ryerson university on public transport?

It's Mississauga, not "mississugha".

The Summerville neighbourhood which is basically the east end of Mississauga around Dundas St. would be the easiest as you just either catch the Mississauga bus 1 which goes along Dundas to Islington station or you walk across the Etobicoke border and catch any of the TTC buses, such as the 112 West Mall route to take you to Kipling Station ( and this way you only pay one fare instead of two ). Once you're on the subway, getting to Ryerson is easy.