I wanted to know if a grass seed like “Scotts” is a quality grass seed and if you have any ideas of where i can get top quality seed in the Toronto area for both sunny areas and shady areas.
Toronto Master Gardeners does not endorse any particular brand but you can determine the best seed or seed mixture for your lawn by reading the label.
Toronto Master Gardens has a Garden Guide that deals with growing a lawn from seed. For more information see https://www.torontomastergardeners.ca/index.php/askagardener/placement-of-grass-seed/
And it also references: https://www.toronto.ca/compost/seeding.htm
Both of these sites have lots of information and should be able to answer all of your questions on the best lawn seeds for both sunny and shady areas.