السلامُ عليكم ورحمةُ الله وبركاتُه.

This is the standard Arabic greeting, meaning "Peace be upon you, and the mercy of God and His blessings." The phrase "فضل السلام" itself doesn[SQ]t have a direct translation that captures its meaning fully. It literally translates to "excellence/virtue of peace," implying the importance and goodness of peace.

To fully understand the implied meaning of "فضل السلام", we need context. It might be used to emphasize the importance of :

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Peace in general:

Highlighting the value of peace and tranquility in society, relationships, or one[SQ]s inner self.
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The greeting of peace ("As-salamu alaykum"):

Emphasizing the spiritual significance and virtue of this Islamic greeting.
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Making peace:

Referring to the virtue and goodness of resolving conflict and seeking reconciliation.

Without more context, it[SQ]s difficult to give a definitive interpretation of "فضل السلام".