You can read code line by line and understand what each line does, but any algorithm that has more than 5 lines of code probably needs an additional step where,

You can read code line by line and understand what each line does, but any algorithm that has more than 5 lines of code probably needs an additional step where, after reading it line by line, you need to take a step back and think about it in a different way to understand what the whole block of code is trying to do.