Online teaching requires faculty development and support to effectively meet the needs of students. Universities should widely recognize that having self-assured and competent online adjunct instructors greatly influences professional sustainability, learning outcomes, and student achievement. The objective of this descriptive study was to gain insights and perspectives on confidence and instructional effectiveness of online adjunct faculty as compared to those who taught on campus or in a blended format, after they participated in an online faculty orientation course. Survey data was collected, and correlational analysis was used to identify relationships between adjunct faculty's perceived confidence and their instructional preparedness in their respective teaching modalities. Results indicate faculty may increase their confidence and instructional effectiveness after participating in an online training course.