People often waste time in the gym bouncing around without any real goal, doing a little bit of this machine and a little bit of that machine.
The simple rule that will always guide you toward the best exercises: the more an exercise makes you move, the bigger the benefits it will deliver.
The biggest mistake that most people make is not building a foundation of strength.
Build the capacity to do the work before you start testing your limits. Volume doesn't have to mean “do sets of 20 reps". You can think of volume over a period of weeks and months.