I'm am ectomorph 52 kgs and 177cm i'm trying to put on a few kgs any advice?

69.5 inches, 115 lbs: To gain weight you have to eat more calories than burned. Do this in a healthy way though. Don't choose junk or fast food. Keep a well balanced diet and make sure you are getting all the nutrients you need. Weight lifting and other muscle building exercises can help you increase your body mass. A primary doctor can examine to confirm that general health appears normal. Muscle size is also genetic.