Track your calories Eat in a 300-500 (probably closer to 500+ given your height) calorie surplus. Get at least 150g protein a day and lift weights with progressive overload Thats it If you need "special" tips as such, then full fat dairy products, peanut butter, cooking with oil and higher fat meat. E.g 15-20% fat mince, chicken thighs as opposed to breasts even mackerel or salmon compared to cod Eat 3 big meals a day, have regular snacks Just do that. And that's it, you're scientifically guaranteed to gain weight with no exceptions whatsoever