OpenJDK container images, Docker commands, JVM ergonomics in containers, sandboxing, multi-arch and K8S tips.

Java command line tools, JPMS, CDS, IDE tips, networking/security properties, Gradle & Maven cheat sheet.

Flight Recorder, JMC, flame graphs, heap/thread dumps, GC logging and system health tools.

OpenSSL & keytool cheat sheet, PKCS#12 truststores, self-signed certs, mTLS, GPG and TLS debugging.

Kotlin compiler options, native image, code style comparisons, and math/diagram rendering samples.