Choosing your first course
Where to start if you are new to university-level material.
If you are coming back to study after years away, start with a course whose prerequisites you already meet. Single-variable calculus and introductory programming are good first steps.
Commit to a pace you can sustain: two lectures a week is enough to finish a full course in a semester.
Do not worry about understanding everything the first time. Lectures are designed to be revisited.