As another comment mentioned, there are a number of college courses that are available on line for free. Pick a subject area, then see if you can find the cours

As another comment mentioned, there are a number of college courses that are available on line for free. Pick a subject area, then see if you can find the course websites for a few different universities' versions of the class. As a rough heuristic, just pick the top N CS schools in some ranking and google "<school> <topic>". If they don't have the videos, try the course site from previous years too (2020 is a good one for lectures being on Youtube). For example, "cmu databases" leads to CMU's Intro to Database Systems, which has all lectures online: https://15445.courses.cs.cmu.edu/fall2022/ https://15445.courses.cs.cmu.edu/fall2022/ . "cmu advanced databases" leads to https://15721.courses.cs.cmu.edu/spring2023/ https://15721.courses.cs.cmu.edu/spring2023/