how to increase calories without fat

People really overthink this.
1.) train heavy
2.) hit your protein and fat goals then fill the rest of your caloric needs with carbs. Slight caloric deficit to lose weight; slight caloric surplus to gain weight
3.) increase calories by 150-200 every 3 weeks if pursuing a surplus; decreases calories by 100 every 3 weeks if trying to consistently lose weight.

Stop watching so many videos on YouTube. Everyone’s trying to make money off of your incompetence, so keep it simple and stay focused.