Any3 tips on how to gain weight?

I'm about 1.63 m (5'3) tall and I weigh 46.7 kg (103 lbs). Since I'm turning 17 soon I've given up the idea of mother Nature helping me out a little😅 and have been going to the gym for like 4 or 5 times a week in the past month with a friend.

I'm looking for any tips when it comes to workouts and food which will help me gain weight. Also, if it helps I tend to store fat in my leg and butt area.
Any3 tips on how to gain weight?
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