If you are interested in the history and technical superiority of the format itself, these resources are highly informative:
: A deep technical look at the open-source architecture and the LZMA algorithm that allows for high compression ratios and strong AES-256 encryption . Safe Practices for 7z Files: HSEKI.7z
: A brief overview of how a single developer in Russia built a free tool that outperformed commercial giants for over a quarter-century. If you are interested in the history and