Somatotypes are really just old pseudo science that persists for some reason. Like most outdated theories there's some basis of fact in there, but they're really just huge oversimplifications and ultimately stereotypes. In fact, the original theories argued that one could deduce a person's temperament and character based on which body type they fit into, which is preposterous.
As for gaining muscle, there are tons of calculators out there that will tell you how many calories and how much protein to eat for muscle gain based on your BMR and activity level, but they're only guidelines. The only surefire way to do it is to stick to a program and then rely on feedback (weight, strength, appearance, body fat measurements, etc.) to modify that to suit you. If you're not gaining strength and weight at a certain calorie level then eat more. Or if you're gaining too much fat too quickly then you can cut back a bit on calories.
And losing weight is the same. If you're not losing weight and dropping fat even though you're eating what a TDEE calculator told you to in order to drop pounds then you need to modify what you're doing by eating less or exercising more.
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