Summary: Lectures are where instructors cover course content, while tutorials provide extra practice and support.
Lectures are the main part of a course where your instructor covers the course material. It is also common for midterms to take place during the lecture time slot.
Tutorials are additional sessions led by teaching assistants that are meant to supplement your learning, such as with practical exercises or short quizzes. The exact format of a tutorial varies between courses and will be explained in the course outline.
If a course has a tutorial, you must register for both a lecture section as well as an associated tutorial section.
