Chess Lesson: Frozen Pieces

I was completing this lesson: https://www.chess.com/mentors/view/7230.
It finishes by saying white wins. However I simply cannot find a winning line. Also I tried the analysis and it showed draw. Is that a mistake in the lesson?

No, I think the lesson is correct. The endpoint assumes you understand a basic concept of king and pawn endgames-the opposition. The position of the king's separated by one square will force black to give way to White's king, which will then win black's pawn and be able to promote its own pawn and win.

Rather than attempt a full explanation, I will look for an article to explain it to you.

Try these lessons- https://www.chess.com/mentor/course/17

You are completely right that I am not very good at pawn endings and that I can benefit doing those lessons. However, the position reached in the end of the lesson: I simply cannot think of any winning line. I would really appreciate if you could tell me how to win the pawn and even advance it... A sequence of moves would be great!

Oh, I am sorry, I made a blunder! 
When thinking about how to win I assumed it was white to play!! You are correct. When revisiting the lesson again I noticed it. I am sorry! I could find the win now

MLAURIE.  Here is a sample variation.  KF7; KF5. KE7; KG6. KF8; KF6. KE8; KE6. KD8;KXD6.   Once you understand this pattern, you can use to solve any other squares black moves to.  The purpose of opposition is to advance your king.  Hope that helps.  Also notice it is an odd number.  Later on, important to know that to get distant opposition.

Thank you Nwap111! I did no understand the odd number factor, but I will try and explore that!!

Welcome.

Black to move.

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