There was recently a thing I worked on where there were multiple similar things that needed to be done. Rather than finishing the beginning of A and then the be

There was recently a thing I worked on where there were multiple similar things that needed to be done. Rather than finishing the beginning of A and then the beginning of B and then C, I opted to finish ALL of A then all of B then all of C. This way, what I learned when working on all of A, I could use to make better decisions about the beginning of B. Then what I learn from doing all of B would be used to help make the beginning of C even better. If I did all the beginnings first, I'd then go back to doing the middle of A and realize I did the beginning wrong and have to go back to fix the beginnings of B and C.