“the road of a guilty person.” This verse makes its point by having us picture two roads (the word “way” and “road” or “path” are the same in Hebrew). The road of the guilty person is crooked. The guilty are always changing their story and adjusting who they are. In contrast, the pure are “straight.” They walk a straight path in who they are and what they do.
“works.” In the Hebrew text “works” is singular, “work,” but it refers to his work as a collective noun, so “works” expresses the thought well in English.