diff --git a/core-java-modules/core-java-collections-4/README.md b/core-java-modules/core-java-collections-4/README.md
index 1c680b86ba..6e117c98b1 100644
--- a/core-java-modules/core-java-collections-4/README.md
+++ b/core-java-modules/core-java-collections-4/README.md
@@ -4,4 +4,4 @@
 
 ### Relevant Articles: 
 
-- TODO: add article links here
+- [ArrayList vs. LinkedList vs. HashMap in Java](https://www.baeldung.com/java-arraylist-vs-linkedlist-vs-hashmap)
diff --git a/core-java-modules/core-java-io-3/README.md b/core-java-modules/core-java-io-3/README.md
index 36617a210e..d0ac5387a8 100644
--- a/core-java-modules/core-java-io-3/README.md
+++ b/core-java-modules/core-java-io-3/README.md
@@ -13,4 +13,5 @@ This module contains articles about core Java input and output (IO)
 - [Reading a Line at a Given Line Number From a File in Java](https://www.baeldung.com/java-read-line-at-number)
 - [Find the Last Modified File in a Directory with Java](https://www.baeldung.com/java-last-modified-file)
 - [Get a Filename Without the Extension in Java](https://www.baeldung.com/java-filename-without-extension)
+- [Writing byte[] to a File in Java](https://www.baeldung.com/java-write-byte-array-file)
 - [[<-- Prev]](/core-java-modules/core-java-io-2)
diff --git a/core-java-modules/core-java-security-2/README.md b/core-java-modules/core-java-security-2/README.md
index bb5e204c98..9b99d624c9 100644
--- a/core-java-modules/core-java-security-2/README.md
+++ b/core-java-modules/core-java-security-2/README.md
@@ -14,4 +14,5 @@ This module contains articles about core Java Security
 - [Get a List of Trusted Certificates in Java](https://www.baeldung.com/java-list-trusted-certificates)
 - [Security Context Basics: User, Subject and Principal](https://www.baeldung.com/security-context-basics)
 - [Java AES Encryption and Decryption](https://www.baeldung.com/java-aes-encryption-decryption)
+- [InvalidAlgorithmParameterException: Wrong IV Length](https://www.baeldung.com/java-invalidalgorithmparameter-exception)
 - More articles: [[<-- prev]](/core-java-modules/core-java-security)
diff --git a/persistence-modules/core-java-persistence-2/README.md b/persistence-modules/core-java-persistence-2/README.md
index 467de757ce..36c33cc6e1 100644
--- a/persistence-modules/core-java-persistence-2/README.md
+++ b/persistence-modules/core-java-persistence-2/README.md
@@ -1,3 +1,4 @@
 ### Relevant Articles:
 
 - [Getting Database URL From JDBC Connection Object](https://www.baeldung.com/jdbc-get-url-from-connection)
+- [JDBC URL Format For Different Databases](https://www.baeldung.com/java-jdbc-url-format)