My Attempts in weight gaining and losing

First attempt:
Diet: In M'sia, most meal taken was eat out. (economic rice and etc).
Results: Gain more fat than muscle mass
Activities: Gym and some sports
Later: loss all of the weight gained and revert back to original state

Second Attempt:
Diet: At Aus, 90% home-cooked meal with literally very low fat and no spices (salt, sugar except tomato sauce). Eat in bulk and frequently.
Results: More muscle mass gained compared than fat.
Activities: Gym and some sports
Later: loss all of the weight gained and revert back to original state

Conclusion:
Dietary pattern is the crucial factor of weight gaining and losing. What you are eating now, is what will make you into.

3rd Attempt: on experimenting
Aim: To discover the burn and lose the fat while maintaining the body size and slower growth
Diet: same as second attempt but eat in moderation and quality of food
Activities: As much as i can get