The #1 Mistake a Beginner Lifter Makes
The hardest thing about starting out in strength training is staying PATIENT. We see it time and again: a newbie learns how to do the main powerlifting movements and then starts loading them as heavy as possible in every session. We get it; it's exciting to make fast progress! But you're likely going to burn yourself out quickly if you're maxing out all the time. Intensity variation is an integral element of a good strength program, regardless of your sport.
If your coach does not prescribe the intensity of the weight on the barbell, get a new coach. Be patient, follow the program, and trust the process.