diff --git a/apache-spark/README.md b/apache-spark/README.md
index 3a2d2f4e15..862626988b 100644
--- a/apache-spark/README.md
+++ b/apache-spark/README.md
@@ -9,3 +9,4 @@ This module contains articles about Apache Spark
 - [Machine Learning with Spark MLlib](https://www.baeldung.com/spark-mlib-machine-learning)
 - [Introduction to Spark Graph Processing with GraphFrames](https://www.baeldung.com/spark-graph-graphframes)
 - [Apache Spark: Differences between Dataframes, Datasets and RDDs](https://www.baeldung.com/java-spark-dataframe-dataset-rdd)
+- [Spark DataFrame](https://www.baeldung.com/spark-dataframes)
diff --git a/core-java-modules/core-java-11-2/README.md b/core-java-modules/core-java-11-2/README.md
index c42b3f0e18..ebd857886d 100644
--- a/core-java-modules/core-java-11-2/README.md
+++ b/core-java-modules/core-java-11-2/README.md
@@ -12,3 +12,4 @@ This module contains articles about Java 11 core features
 - [Java HTTPS Client Certificate Authentication](https://www.baeldung.com/java-https-client-certificate-authentication)
 - [Call Methods at Runtime Using Java Reflection](https://www.baeldung.com/java-method-reflection)
 - [Java HttpClient Basic Authentication](https://www.baeldung.com/java-httpclient-basic-auth)
+- [Java HttpClient With SSL](https://www.baeldung.com/java-httpclient-ssl)
diff --git a/core-java-modules/core-java-collections-2/README.md b/core-java-modules/core-java-collections-2/README.md
index e5f6126811..d482ed7773 100644
--- a/core-java-modules/core-java-collections-2/README.md
+++ b/core-java-modules/core-java-collections-2/README.md
@@ -12,3 +12,4 @@
 - [Sorting in Java](https://www.baeldung.com/java-sorting)
 - [Getting the Size of an Iterable in Java](https://www.baeldung.com/java-iterable-size)
 - [Java Null-Safe Streams from Collections](https://www.baeldung.com/java-null-safe-streams-from-collections)
+- [Differences Between Iterator and Iterable and How to Use Them?](https://www.baeldung.com/java-iterator-vs-iterable)
diff --git a/core-java-modules/core-java-concurrency-advanced-4/README.md b/core-java-modules/core-java-concurrency-advanced-4/README.md
index 808db89b12..d9207644b3 100644
--- a/core-java-modules/core-java-concurrency-advanced-4/README.md
+++ b/core-java-modules/core-java-concurrency-advanced-4/README.md
@@ -6,3 +6,4 @@
 - [Volatile Variables and Thread Safety](https://www.baeldung.com/java-volatile-variables-thread-safety)
 - [Producer-Consumer Problem With Example in Java](https://www.baeldung.com/java-producer-consumer-problem)
 - [Acquire a Lock by a Key in Java](https://www.baeldung.com/java-acquire-lock-by-key)
+- [Differences Between set() and lazySet() in Java Atomic Variables](https://www.baeldung.com/java-atomic-set-vs-lazyset)
diff --git a/core-java-modules/core-java-lang-5/README.md b/core-java-modules/core-java-lang-5/README.md
index 012f4edc51..8920e9c231 100644
--- a/core-java-modules/core-java-lang-5/README.md
+++ b/core-java-modules/core-java-lang-5/README.md
@@ -2,4 +2,6 @@
 
 This module contains articles about core features in the Java language
 
-## TODO ##
+### Relevant Articles:
+
+- [Difference Between == and equals() in Java](https://www.baeldung.com/java-equals-method-operator-difference)
diff --git a/core-java-modules/core-java-lang-math-3/README.md b/core-java-modules/core-java-lang-math-3/README.md
index 1dd3a3c7e0..3ddaddae39 100644
--- a/core-java-modules/core-java-lang-math-3/README.md
+++ b/core-java-modules/core-java-lang-math-3/README.md
@@ -5,4 +5,5 @@
 ### Relevant articles:
 
 - [Evaluating a Math Expression in Java](https://www.baeldung.com/java-evaluate-math-expression-string)
+- [Swap Two Variables in Java](https://www.baeldung.com/java-swap-two-variables)
 - More articles: [[<-- Prev]](/core-java-modules/core-java-lang-math-2)
diff --git a/docker/docker-push-to-private-repo/README.md b/docker/docker-push-to-private-repo/README.md
index e320af31b4..61fe00e016 100644
--- a/docker/docker-push-to-private-repo/README.md
+++ b/docker/docker-push-to-private-repo/README.md
@@ -1 +1,3 @@
-### Relevant Articles:
\ No newline at end of file
+### Relevant Articles:
+
+- [Pushing a Docker Image to a Private Repository](https://www.baeldung.com/ops/docker-push-image-to-private-repository)
diff --git a/docker/docker-spring-boot/README.md b/docker/docker-spring-boot/README.md
index 4af9378290..0fc9d2b6b5 100644
--- a/docker/docker-spring-boot/README.md
+++ b/docker/docker-spring-boot/README.md
@@ -1,3 +1,4 @@
 ### Relevant Articles:
 
 - [Creating Docker Images with Spring Boot](https://www.baeldung.com/spring-boot-docker-images)
+- [Starting Spring Boot Application in Docker With Profile](https://www.baeldung.com/spring-boot-docker-start-with-profile)
diff --git a/persistence-modules/hibernate-queries/README.md b/persistence-modules/hibernate-queries/README.md
index ac52e73abf..f5cba1aa6f 100644
--- a/persistence-modules/hibernate-queries/README.md
+++ b/persistence-modules/hibernate-queries/README.md
@@ -11,3 +11,4 @@ This module contains articles about use of Queries in Hibernate.
 - [Hibernate Query Plan Cache](https://www.baeldung.com/hibernate-query-plan-cache)
 - [Hibernate’s addScalar() Method](https://www.baeldung.com/hibernate-addscalar)
 - [Distinct Queries in HQL](https://www.baeldung.com/java-hql-distinct)
+- [JPA and Hibernate – Criteria vs. JPQL vs. HQL Query](https://www.baeldung.com/jpql-hql-criteria-query)
diff --git a/persistence-modules/spring-data-jpa-query-3/README.md b/persistence-modules/spring-data-jpa-query-3/README.md
index 246b6ebf3d..920ec40965 100644
--- a/persistence-modules/spring-data-jpa-query-3/README.md
+++ b/persistence-modules/spring-data-jpa-query-3/README.md
@@ -4,6 +4,7 @@ This module contains articles about querying data using Spring Data JPA.
 
 ### Relevant Articles: 
 - [Query Entities by Dates and Times with Spring Data JPA](https://www.baeldung.com/spring-data-jpa-query-by-date)
+- [JPA and Hibernate – Criteria vs. JPQL vs. HQL Query](https://www.baeldung.com/jpql-hql-criteria-query)
 - More articles: [[<-- prev]](../spring-data-jpa-query-2)
 
 ### Eclipse Config 
diff --git a/spring-boot-modules/spring-boot-mvc-2/README.md b/spring-boot-modules/spring-boot-mvc-2/README.md
index 0d0e05daf0..30e6d71a30 100644
--- a/spring-boot-modules/spring-boot-mvc-2/README.md
+++ b/spring-boot-modules/spring-boot-mvc-2/README.md
@@ -11,4 +11,5 @@ This module contains articles about Spring Web MVC in Spring Boot projects.
 - [Testing Web APIs with Postman Collections](https://www.baeldung.com/postman-testing-collections)
 - [Spring Boot Consuming and Producing JSON](https://www.baeldung.com/spring-boot-json)
 - [Serve Static Resources with Spring](https://www.baeldung.com/spring-mvc-static-resources)
+- [Add Header to Every Request in Postman](https://www.baeldung.com/postman-add-headers-pre-request)
 - More articles: [[prev -->]](/spring-boot-modules/spring-boot-mvc)
diff --git a/spring-di-3/README.md b/spring-di-3/README.md
index 4246069616..3ddd720af5 100644
--- a/spring-di-3/README.md
+++ b/spring-di-3/README.md
@@ -6,4 +6,5 @@ This module contains articles about dependency injection with Spring
 
 - [@Lookup Annotation in Spring](https://www.baeldung.com/spring-lookup)
 - [Spring @Autowired Field Null – Common Causes and Solutions](https://www.baeldung.com/spring-autowired-field-null)
+- [Finding All Beans with a Custom Annotation](https://www.baeldung.com/spring-injecting-all-annotated-beans)
 - More articles: [[<-- prev]](../spring-di-2)
diff --git a/spring-security-modules/spring-security-opa/README.md b/spring-security-modules/spring-security-opa/README.md
new file mode 100644
index 0000000000..d2c1652edb
--- /dev/null
+++ b/spring-security-modules/spring-security-opa/README.md
@@ -0,0 +1,4 @@
+
+### Relevant Articles:
+
+- [Spring Security Authorization with OPA](https://www.baeldung.com/spring-security-authorization-opa)