Alternatively, just use (Google Maps/Apple Maps/City Mapper/Transit/et al.)'s routing. Their routing will generally be better than what most locals could come

Alternatively, just use (Google Maps/Apple Maps/City Mapper/Transit/et al.)'s routing. Their routing will generally be better than what most locals could come up with. Although I have noticed that Google Maps tends to assume that transferring between lines has an effectively-zero wait time which is far from the truth in most cases.