You can also look up for these other topics:
Framework
Coding Standards
Boilerplate
CMS
Tool
Security
Hacktoberfest
Adds extra security-related features in your Symfony application
nelmioBuild Content-Security-Policy headers from a JSON file (or build them programmatically)
paragonieCollection of scripts, thoughts about CSP (Content Security Policy)
nico3333frA PHP library aiming to make the use of browser security features more accessible.
aidantwoods