What are the plans in this position?

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I played black and reached this position. (If black made mistakes prior to this position, I am also interested to know.)

in the diagram position, what is white's best plan? Does black have counterplay? I felt like after 14.f4 I would have a worse position without having made any clear mistakes.

The game continued: 14.0-0-0. After this move, what has changed? How can black play against this?

I later won the game, but it was due to my opponent blundering and not relevant to this position.