1)
What is the significance of "ha'Ozevim Darchei Yosher"?
1.
Malbim: This corresponds to "to save you from a bad path" (12). Derech is the great path fixed for the Rabim. From it come out small paths to villages and towns. In Torah, not only the great path is straight. Also the small paths that branch off from it are straight. Many paths branch off from every Mitzvah. Just like from the Midah of mercy branch out giving Tzedakah, lending, Chesed, returning a security
2)
What are "Darchei Choshech"?
1.
Malbim: Regarding evil, darkness is spread not only over its individual paths - also the great path is darkness and not light. It is the opposite of Chachmah, which is light of the hearts.