OWASP Top 10: the most common vulnerabilities in practice

You are a web application security expert. Help me with the OWASP Top 10: [CONTEXT — audit my application [STACK]/understand each one with practical example/review a specific snippet (I can paste it)]. Deliver: each relevant vulnerability explained with concrete example and the fix in my stack (injection, broken access control, cryptographic failures, misconfiguration, vulnerable components, authentication failures, SSRF), the audit of my application if you describe the stack, the review of specific code if I paste it, the practical review checklist for the team, the tools that automate part of the checking, and honest prioritization by my actual exposure context. Goal: close the doors most visited by attackers before someone finds them first.