How can I gain weight and muscle as quick and safely as possible without the use of supplements?

I am 120lbs, 16 years old and about 6ft. I am pretty skinny. I can’t find a way to work out and eat correctly and gain mass. How can I do this as quick as possible without the use of supplements? Also, how long of a workout a day, and for how long do I need to keep it running for? Also, how long will this process take overall? Thank you.

Weightlifting and a diet high in protein ,

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