Computing For All
Broad Look at Computing
AP CS Principles
AP CS Principles is an AP course for high school students that broadly explores many different areas of computing. There are a number of organizations that have made their materials online and available for free (including videos, slides, assignments).
Crash course has some very good short videos to learn about various areas of computing.
Coding/Programming with 0 Background
Here are a few you can try out. There are many others. Pick one that makes sense to you and go with it.