Long time ago, I've really enjoyed a course by David Evans from Virginia University about building a search engine and concepts of computer science.

Building a "classic" search engine is a very fun project to go through.

https://www.cs.virginia.edu/~evans/courses/cs101/

List: https://www.youtube.com/watch?v=9nkR2LLPiYo&list=PLAwxTw4SYa...

Dave's profile: https://www.cs.virginia.edu/~evans/