diff --git a/apache-spark/README.md b/apache-spark/README.md
index c60b556d51..3a2d2f4e15 100644
--- a/apache-spark/README.md
+++ b/apache-spark/README.md
@@ -8,3 +8,4 @@ This module contains articles about Apache Spark
 - [Building a Data Pipeline with Kafka, Spark Streaming and Cassandra](https://www.baeldung.com/kafka-spark-data-pipeline)
 - [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)
diff --git a/core-java-modules/core-java-lang-3/README.md b/core-java-modules/core-java-lang-3/README.md
index 598014bb92..0707d0de98 100644
--- a/core-java-modules/core-java-lang-3/README.md
+++ b/core-java-modules/core-java-lang-3/README.md
@@ -7,4 +7,5 @@ This module contains articles about core features in the Java language
 - [When are Static Variables Initialized in Java?](https://www.baeldung.com/java-static-variables-initialization)
 - [Checking if a Class Exists in Java](https://www.baeldung.com/java-check-class-exists)
 - [The Difference Between a.getClass() and A.class in Java](https://www.baeldung.com/java-getclass-vs-class)
+- [Constants in Java: Patterns and Anti-Patterns](https://www.baeldung.com/java-constants-good-practices)
 - [[<-- Prev]](/core-java-modules/core-java-lang-2)
diff --git a/core-java-modules/core-java-networking-2/README.md b/core-java-modules/core-java-networking-2/README.md
index fa49c35bf8..9def4c8eb6 100644
--- a/core-java-modules/core-java-networking-2/README.md
+++ b/core-java-modules/core-java-networking-2/README.md
@@ -14,4 +14,5 @@ This module contains articles about networking in Java
 - [Handling java.net.ConnectException](https://www.baeldung.com/java-net-connectexception)
 - [Getting MAC addresses in Java](https://www.baeldung.com/java-mac-address)
 - [Sending Emails with Attachments in Java](https://www.baeldung.com/java-send-emails-attachments)
+- [Finding a Free Port in Java](https://www.baeldung.com/java-free-port)
 - [[<-- Prev]](/core-java-modules/core-java-networking)
diff --git a/persistence-modules/core-java-persistence-2/README.md b/persistence-modules/core-java-persistence-2/README.md
new file mode 100644
index 0000000000..467de757ce
--- /dev/null
+++ b/persistence-modules/core-java-persistence-2/README.md
@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Getting Database URL From JDBC Connection Object](https://www.baeldung.com/jdbc-get-url-from-connection)
diff --git a/persistence-modules/spring-boot-persistence-2/README.md b/persistence-modules/spring-boot-persistence-2/README.md
index 392218d2bf..e7f32053e4 100644
--- a/persistence-modules/spring-boot-persistence-2/README.md
+++ b/persistence-modules/spring-boot-persistence-2/README.md
@@ -5,4 +5,5 @@
 - [Integrating Spring Boot with HSQLDB](https://www.baeldung.com/spring-boot-hsqldb)
 - [List of In-Memory Databases](https://www.baeldung.com/java-in-memory-databases)
 - [Oracle Connection Pooling With Spring](https://www.baeldung.com/spring-oracle-connection-pooling)
+- [Object States in Hibernate’s Session](https://www.baeldung.com/hibernate-session-object-states)
 - More articles: [[<-- prev]](../spring-boot-persistence)
diff --git a/persistence-modules/spring-persistence-simple/README.md b/persistence-modules/spring-persistence-simple/README.md
index 8bef16868d..34211e981e 100644
--- a/persistence-modules/spring-persistence-simple/README.md
+++ b/persistence-modules/spring-persistence-simple/README.md
@@ -7,6 +7,7 @@
 - [Transaction Propagation and Isolation in Spring @Transactional](https://www.baeldung.com/spring-transactional-propagation-isolation)
 - [JTA Transaction with Spring](https://www.baeldung.com/spring-vs-jta-transactional)
 - [Test a Mock JNDI Datasource with Spring](https://www.baeldung.com/spring-mock-jndi-datasource)
+- [Detecting If a Spring Transaction Is Active](https://www.baeldung.com/spring-transaction-active)
 
 ### Eclipse Config 
 After importing the project into Eclipse, you may see the following error:  
diff --git a/spring-boot-modules/spring-boot-annotations/README.md b/spring-boot-modules/spring-boot-annotations/README.md
index a721f28d55..6ead94de86 100644
--- a/spring-boot-modules/spring-boot-annotations/README.md
+++ b/spring-boot-modules/spring-boot-annotations/README.md
@@ -9,3 +9,4 @@ This module contains articles about Spring Boot annotations
 - [Spring Web Annotations](https://www.baeldung.com/spring-mvc-annotations)
 - [Spring Core Annotations](https://www.baeldung.com/spring-core-annotations)
 - [Spring Bean Annotations](https://www.baeldung.com/spring-bean-annotations)
+- [Difference Between @ComponentScan and @EnableAutoConfiguration in Spring Boot](https://www.baeldung.com/spring-componentscan-vs-enableautoconfiguration)