Public transport in GTA

Hi,
I need some information on Public Transport - frequency and availability - from the suburbs of Toronto. There is a lot of info about how public transportation is great in Toronto but I’m interested in commuting from the suburbs to Toronto or within the suburbs. Which is a better suburb in terms of public transport - apart from Toronto?

Thanks!

This is a good starting point to see public transport coverage:
https://www.gotransit.com/en/trip-planning/system-and-route-map