This is a superscription that tells about the psalm. Some scholars say that this is part of the scripture and some say that it is not. (See "What are Superscriptions in Psalms" in [Introduction to Psalms](../front/intro.md).)
The words "right hand" and "holy arm" refer to Yahweh's strength. Together they emphasize how great his strength is. Alternate translation: "his very great power has" (See: [[rc://en/ta/man/jit/figs-metonymy]] and [[rc://en/ta/man/jit/figs-doublet]])
This can be restated to remove the abstract noun "victory." Alternate translation: "have enabled him to be victorious over his enemies" or "has enabled him to defeat his enemies" (See: [[rc://en/ta/man/jit/figs-abstractnouns]])