Dive into a comprehensive 50-minute crash course on Varnish, the powerful HTTP accelerator and reverse proxy web server. Learn how Varnish works, set up a Varnish Docker container, and explore its pros and cons. Cover topics including classic HTTP architecture, HTTP and HTTPS setups, cache invalidation, load balancing, backend connection pooling, and Varnish modules. Gain hands-on experience with Docker commands and VCL configuration. Discover Varnish's capabilities in caching, prefetching documents, DNS resolution, script optimization, and edge side includes. Understand its limitations with HTTPS, POST requests, and HTTP/2 backends. Perfect for developers and system administrators looking to optimize web performance.