I don't really understand this story. Could somebody please explain it for me please?

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Be very glad to maam. This is our take on it, perhaps you will agree that was the lesson:
Like the fig tree, the nation of Israel has a deceptive appearance. The people of this nation are in a covenant relationship with God, and they might outwardly appear to observe his Law. However, the nation as a whole has proved to be both lacking faith and barren of good fruitage. They even reject God’s own Son! Hence, by causing the unproductive fig tree to wither, Jesus demonstrates what the end will be for this fruitless, faithless nation.
Jesus went on to explain that faith was a needed quality among his followers, strong faith. So we believe it was a lesson given to show them the importance of having a strong faith in God. Living that faith as well.
Hope that helps April