There Goes My Hero

How to think through making big hero calls on the river

Hand 1 - Calling a check-raise with A4 on 654QK

Hand 2 - Calling 3-barrels with QQ on 63277 xddxx

Hand 3 - Calling a big river bet with T9 on 85496

Hand 4 - Calling a turn raise and river bomb with 73s on T748K hshsx