Start with the Bitcoin Whitepaper. If you don't understand all of it don't worry. Treat it like an article with advanced vocabulary and look up the words or concepts you don't know yet.

Old Andreas Antonopolous videos are very good too. Jameson Lopp also has a great list of resources. You should be able to search for his page.

You can also ask questions here. I'm sure many people would love to help fill in any gaps.

Welcome aboard!