@robinjohn12,
In order to achieve your goal which is to build muscle, you gotta focus on eating muscle building foods like eggs, nuts, lean beef, protein shakes, cottage cheese, chickpeas, lentils, salmon, scallops, and other protein rich foods and veggies. Aside from eating the right foods, you still have to workout and do a full body workout routine like doing barbel, barbel bench press, barbel shoulder press, dumbbell, pull-ups, push press, etc. I hope that helps, good luck in your body building journey.