Are you a beginner? Some beginners go immediately to the advanced training programs because that will lead to 'advanced' results. Complete bogus.
If you're just starting out with lifting, as long as you're consistent, literally anything you do in the gym will increase muscle mass. Beginner gains are a wonderful thing. It's similar to how runners drop 30+ seconds a year in the 5k for the first few years they start training.
Anyway, focus on your big three compound lifts: bench, squat, deadlift. These are THE most important lifts you can do to add size and strength. Try doing 4-5 sets of 8-10 reps with 2-3min rest between sets to maximize hypertrophy of muscle. Make sure that you're doing these lifts 2x a week.
Look into a proper lifting split routine. Upper/Lower and Leg/Press/Pull are probably the two most popular splits. You can find a lot of programs online that will guide you with these two splits.
Lastly, don't become a curlbro and focus on solely upper body. And go f*ck yourself if you ever do culrs in the squat rack.
Good luck.