If you want to learn what research says is the optimal number of sets to do per workout to build muscle, then you need to read this article.
How Many Sets Per Workout Should You Do To Build Muscle?
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How Many Sets Should You Do Per Workout to Build Muscle?
How Many Sets Per Workout Should You Do To Build Muscle?
Hypertrophy Training Volume: How Many Sets to Build Muscle?
Can my workout be just 3 exercises but with free weights and heavy weights for muscle building or is that too little (side note I also have days where I use machines)?
How Many Sets Should You Do Per Workout to Build Muscle?
How to Build Muscle with Hypertrophy Training: 5 Expert Tips