diff --git a/src/blogs.md b/src/blogs.md
index 4309197..02102fe 100644
--- a/src/blogs.md
+++ b/src/blogs.md
@@ -16,7 +16,6 @@
 - [Joel on Software](https://www.joelonsoftware.com/)
 - [fasterthanlime](https://fasterthanli.me/)
 - [Happy Path Programming](https://anchor.fm/happypathprogramming/episodes/66-The-Journey-to-Rust-with-Christopher-Hunt-e1meaqh)
-- [Programming Talks](https://www.programmingtalks.org)
 - [Oddly Influenced](https://podcast.oddly-influenced.dev/)
 - [The Buckblog, assorted ramblings by Jamis Buck](https://weblog.jamisbuck.org/)
 - [Gwern](https://www.gwern.net/)
diff --git a/src/cloud.md b/src/cloud.md
index ab0653d..edb0813 100644
--- a/src/cloud.md
+++ b/src/cloud.md
@@ -1,6 +1,5 @@
 ## Cloud Computing, Containers & DevOps
 
-- [Java Cloud Development Introduction and Tools](https://howtodoinjava.com/cloud/java-cloud-development-introduction-and-tools)
 - [A beginner's guide to building DevOps pipelines with open source tools](https://opensource.com/article/19/4/devops-pipeline)
 - [Cloud Application Platform vs Container as a Service vs VM hosted application](https://www.suse.com/c/cap-vs-caas-vs-vm-hosted-application/)
 - Containers and Orchestration:
@@ -35,7 +34,7 @@
   - [Docker Swarm](https://docs.docker.com/engine/swarm/)
   - [Apache Mesos](https://mesos.apache.org/)
   - [LXD](https://linuxcontainers.org/lxd/)
-  - [Cloud Foundry](https://docs.cloudfoundry.org/buildpacks/java/index.html)
+  - [Cloud Foundry](https://docs.cloudfoundry.org)
   - [Nomad](https://www.nomadproject.io/)
 - CI/CD Pipelines:
   - [Jenkins](https://www.edx.org/course/introduction-to-jenkins)
diff --git a/src/db.md b/src/db.md
index 58e41ee..8e426fb 100644
--- a/src/db.md
+++ b/src/db.md
@@ -24,7 +24,7 @@
     - MariaDB
 - Non-Relational DBs (**NoSQL**) by Type:
     - Wide column: Apache Cassandra
-    - Document: [ElasticSearch](https://www.baeldung.com/elasticsearch-java), MongoDB
+    - Document: ElasticSearch), MongoDB
     - Key-value: [Redis](https://architecturenotes.co/redis/)
     - Graph: Neo4J
 - [What is a Vector Database?](https://www.pinecone.io/learn/vector-database/)
diff --git a/src/doc.md b/src/doc.md
index be4f649..e43c164 100644
--- a/src/doc.md
+++ b/src/doc.md
@@ -1,6 +1,5 @@
 ## Software Documentation
 
-- [How to Write Doc Comments for the Javadoc Tool](https://www.oracle.com/technical-resources/articles/java/javadoc-tool.html)
 - [Markdown Basic Syntax](https://www.markdownguide.org/basic-syntax/)
 - [Documenting APIs: A guide for technical writers and engineers](https://idratherbewriting.com/learnapidoc/)
 - [How Big Tech Runs Tech Projects and the Curious Absence of Scrum](https://blog.pragmaticengineer.com/project-management-at-big-tech/)
diff --git a/src/ipc.md b/src/ipc.md
index 2058d45..0d707cf 100644
--- a/src/ipc.md
+++ b/src/ipc.md
@@ -22,12 +22,12 @@
             - [HTTP/3 explained](https://http3-explained.haxx.se/)
             Real-time communication protocols:
               - [Full-duplex HTTP Streaming](https://datatracker.ietf.org/doc/html/draft-zhu-http-fullduplex-08)
-              - [WebSockets](https://www.baeldung.com/java-websockets)
+              - WebSockets
               - [Server-Sent Events (SSE)](https://en.wikipedia.org/wiki/Server-sent_events)
               - [WebTransport](https://developer.chrome.com/docs/capabilities/web-apis/webtransport#whats_webtransport)
               - [WebRTC](https://webrtcforthecurious.com/)
-          - [UDP](https://www.baeldung.com/udp-in-java)
-        - [Unix Domain Sockets](https://nipafx.dev/java-unix-domain-sockets/)
+          - [UDP
+        - Unix Domain Sockets
     - Messaging:
         - AMQP
         - MQTT
diff --git a/src/misc.md b/src/misc.md
index ca10647..61a50ee 100644
--- a/src/misc.md
+++ b/src/misc.md
@@ -17,7 +17,6 @@
 - Internationalization and localization (i18n)
   - [PO Files](https://www.gnu.org/software/gettext/manual/html_node/PO-Files.html)
 - Dates:
-  - [All About java.util.Date](https://codeblog.jonskeet.uk/2017/04/23/all-about-java-util-date/)
   - [UTC is enough for everyone... right?](https://zachholman.com/talk/utc-is-enough-for-everyone-right)
   - [Storing UTC is not a silver bullet](https://codeblog.jonskeet.uk/2019/03/27/storing-utc-is-not-a-silver-bullet/)
   - [Designing a REST API: Unix time vs ISO-8601](https://nickb.dev/blog/designing-a-rest-api-unix-time-vs-iso-8601)
@@ -36,7 +35,6 @@
   - [Optimizing Linux for Slow Computers](https://www.akitaonrails.com/2017/01/17/optimizing-linux-for-slow-computers)
   - [Linux Hardening Guide](https://madaidans-insecurities.github.io/guides/linux-hardening.html#choosing-the-right-distro)
 - Libraries
-  - [Google Best Practices for Java Libraries](https://jlbp.dev/)
   - [Choose Boring Technology](https://boringtechnology.club/)
 - Testing:
   - [Modern Best Practices for Testing in Java](https://phauer.com/2019/modern-best-practices-testing-java/)
@@ -48,7 +46,6 @@
   - [Interface Pollution](https://rakyll.org/interface-pollution/)
 - Code Formatting:
   - [EditorConfig](https://editorconfig.org/)
-  - [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html)
 - HTTP:
   - CORS:
     - [Developers don't understand CORS](https://fosterelli.co/developers-dont-understand-cors)
@@ -85,7 +82,6 @@
   - [How to hide your IP address](https://educatedguesswork.org/posts/traffic-relaying/)
 - Memory:
   - [What Every Programmer Should Know About Memory](https://people.freebsd.org/~lstewart/articles/cpumemory.pdf)
-  - [What Should I Know About Garbage Collection as a Java Developer?](https://www.azul.com/blog/what-should-i-know-about-garbage-collection-as-a-java-developer/)
 - Performance:
   - [Latency Numbers Every Programmer Should Know](https://samwho.dev/numbers/)
   - [Good performance is not just big O](https://jmmv.dev/2023/09/performance-is-not-big-o.html)
diff --git a/src/security.md b/src/security.md
index 21901a0..e6d0f3d 100644
--- a/src/security.md
+++ b/src/security.md
@@ -10,7 +10,6 @@
 - Zalewski, *Tangled Web. A Guide to Securing Modern Web Applications*
 - [OWASP Cheat Sheet Series](https://cheatsheetseries.owasp.org/index.html)
 - [Practical Cryptography for Developers](https://cryptobook.nakov.com/)
-- [How to find third-party vulnerabilities in your Java code](https://www.redhat.com/sysadmin/find-java-vulnerabilities)
 - [Web Security Academy](https://portswigger.net/web-security) (n.b. this course is the updated version of the book *The Web Application Hacker's Handbook*)
 - [See this page fetch itself, byte by byte, over TLS](https://subtls.pages.dev/)
 - [The Illustrated TLS 1.3 Connection](https://tls13.xargs.org/)
diff --git a/src/system-design.md b/src/system-design.md
index 41e99ea..68d78bb 100644
--- a/src/system-design.md
+++ b/src/system-design.md
@@ -1,6 +1,5 @@
 ## Microservices, Distributed Systems & System Design
 
-- [From Microservices to Distributed Systems: A Survival Guide for Java Devs](https://dzone.com/articles/from-microservices-to-distributed-systems-survival)
 - [Learning about distributed systems: where to start?](https://muratbuffalo.blogspot.com/2020/06/learning-about-distributed-systems.html?m=1)
 - [Microservices Patterns](https://microservices.io/patterns/index.html)
 - [Patterns of Distributed Systems](https://martinfowler.com/articles/patterns-of-distributed-systems/)