Depending on the angle of your sternum when lying down it’s either flat bench press or incline bench press for the most development. Either barbell or dumbbell. Probably later if new at it.
Dips/weighted dips are also great if you know the proper technique and the bars are spaced just right for you
I’m doing heavy barbell bench press for strength on one day and dumbbell bench press for mass on another. Definitely noticed a positive change after I swapped 2nd barbell bench press day to dumbbell.
As for rep range, 8-12 is the hypertrophy (or mass building) range. I personally go for 12.
Exercises that @sandcubicle.bsky.social mentioned are great. Believe it or not, daily push-ups will help you get stronger also. Find the exercises that get you the most pump, play with big rep ranges and exercises. Don't rule out machines, they serve their purpose. Track sets and weights & increase
Hypertrophy rep range is where you want to be. No magic exercise that will get you there. The most important thing I know I fail at is proper nutrition and rest for recovery to help muscles rebuild. Find exercises that get you to move full range, heavy db that you move well works. Takes time.
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Dips/weighted dips are also great if you know the proper technique and the bars are spaced just right for you
As for rep range, 8-12 is the hypertrophy (or mass building) range. I personally go for 12.