> For the complete documentation index, see [llms.txt](https://abdulrahman-1.gitbook.io/my-digital-garden/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://abdulrahman-1.gitbook.io/my-digital-garden/level-2-system-design/step-4-low-level-detailed-design-system/security.md).

# Security

### Authentication

{% embed url="<https://www.youtube.com/watch?ab_channel=Twilio&v=j8Yxff6L_po>" %}

{% embed url="<https://www.linkedin.com/learning/advanced-express/understanding-cookies-and-sessions?autoplay=true>" %}

{% embed url="<https://www.youtube.com/watch?ab_channel=CodeRealm&t=380s&v=2PPSXonhIck>" %}

## <mark style="background-color:orange;">**Very important cheat sheet**</mark>

{% embed url="<https://cheatsheetseries.owasp.org/Glossary.html>" %}