How do I implement rate limiting on my website API?

Implement rate limiting to prevent API abuse on Connect Quest VPS at connectquest.co.in: Nginx: `limit_req_zone $binary_remote_addr zone=api:10m rate=100r/m`. For PHP: use Redis-based rate limiter. For WordPress REST API: use WP REST API Rate Limit plugin. Return 429 Too Many Requests status with Retry-After header. Log rate limit violations for threat analysis.