How often do you actually read through the code, trying to understand what's happening and you need english language? Once you read an english description - do

How often do you actually read through the code, trying to understand what's happening and you need english language? Once you read an english description - do you still often have to look at the code to understand what is really happening? //complete purchase process - what does that mean? When you look at the method, I see exactly what's being called and with what parameters.