Understand what is required of you in order to achieve your goals.
I was recently speaking to someone who told me he wanted to get stronger. When I asked him what his training was like, he told me he was following a popular program he found on the Internet that had him doing 25 rep sets on his key lifts. He then questioned me as to why I trained my key lifts in sets of 1-5 reps.

Your goals should define the way you train and your program. They inform your decisions on rest between sets, overall workout volume, rep ranges to aim for, exercises you do, intensity and recovery days you take.
Don't just follow advice given to you regarding any parameter of your training without considering your goals first and how if it truly suits your purposes.