A complete spiritual life requires a delicate balance between actively doing good and actively avoiding harm. A person needs both divine guidance to walk the right path and divine protection to keep negative forces from taking control.
The initial plea asks God to direct and steady a person's steps, habits, and daily behaviors. The goal is for these everyday actions to follow a straight path guided by His word. The primary approach among commentators is that this focuses on asking for help to fulfill the positive Commandments [רד״ק, אבן עזרא]. Adding a spiritual layer to this idea, [אלשיך] explains that God's word is a living force. When a person engages with the Torah, it generates a divine energy that actively prepares and assists their steps in carrying out these good deeds.
The focus then shifts to the avoidance of negative Commandments. Sin and evil are fundamentally empty concepts with no real substance, yet they pose a constant threat. The prayer asks that the evil inclination or difficult life circumstances will not gain the power to rule over a person and drag them into wrongdoing. This reflects a deep desire to be saved from absolutely any offense, even the slightest misstep [רד״ק], or any unintentional mistake [מאירי].
These two aspects of the prayer are deeply connected. Just as fulfilling the Torah creates a positive force that guides a person forward, every sin creates an impure force that holds a person back and pulls them into further mistakes. Therefore, the hope is that the strength of God's word will be the very thing that prevents sin from taking over [אלשיך]. Ultimately, as [אבן עזרא] notes in the name of Rabbi Moshe, sin has the dangerous potential to become an independent entity that dictates a person's life, and escaping that exact control is the heart of this request.