If I were in your shoes, I'd search for books and online courses. Here's a couple I found on GitHub:
Modern Computer Architecture and Organization - https://github.com/PacktPublishing/Modern-Computer-Architect...
Introduction To 80x86 Assembly Language And Computer Architecture - Richard C. Detmer - https://github.com/abhinavkorpal/awesome-computer-science-EB... (PDF)
Some video courses:
https://github.com/Developer-Y/cs-video-courses#computer-org...