What should I do to gain weight?

I'm turning 17 soon, been working out for the last months (Running, basic stuff), but recently I've been thinking of gaining actual weight and start building up weight. Last time I weighed myself I was at 125 lb being 5' 10.5'. I've been battling with my eating disorder throughout my teenhood, which still troubles me today.

Any tips or advice I could take on this? Thanks!

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