This is hands down the best introduction to computer science available. Find the latest version on YouTube (here is [2024](https://youtu.be/3LPJfIKxwWc?si=CDbmyUWUFFVuf3jt)). The course is offered for free through the HarvardX program. HarvardX also offers other free courses through the [CS50 program](https://www.youtube.com/@cs50) that are probably worth checking out.