diff --git a/readme.md b/readme.md
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--- a/readme.md
+++ b/readme.md
@@ -13,4 +13,8 @@ Session 1 - 26/10/2022 - stoped reading [@here](https://sparkers.udemy.com/cours
 
 Session 2 - 27/10/2022 - finished unit 1
 
-Session 3 - 28/10/2022 - ended [@here](https://sparkers.udemy.com/course/spring-framework-5-beginner-to-guru/learn/practice/1161612#overview)
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+Session 3 - 28/10/2022 - spring initializr, open a spring project in IntelliJ and github workflow
+
+Session 4 - 30/10/2022 - JPA entities
+
+Session 5 - 31/10/2022 - Equality in hibernate and spring data repositories
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diff --git a/unit2_building_spring_boot_webapp.md b/unit2_building_spring_boot_webapp.md
index 8e1a175..7675be5 100644
--- a/unit2_building_spring_boot_webapp.md
+++ b/unit2_building_spring_boot_webapp.md
@@ -46,6 +46,9 @@ From the currated dependancies you can omit the version when you add them to you
 Session 3 - 28/10/2022 - ended here
 
 <hr>
+
+
+
 ## Github Workflow
 
 [Starts from here](https://sparkers.udemy.com/course/spring-framework-5-beginner-to-guru/learn/lecture/17789252#overview) Github workflow.
@@ -137,5 +140,42 @@ Session 4 - 30/10/2022 : ended here
 <hr>
 
 
+### Equality in Hibernate
+
+[Starts from here](https://sparkers.udemy.com/course/spring-framework-5-beginner-to-guru/learn/lecture/17792132#notes) Equality in hibernate
+
+Leakage necessary - hibernates uses equals and hashcode methods.
+
+#### Equals and HashCode
+
+`@Override` the methods to have a logic around the id property.
+
+**Tips**: use `alt+insert` equals() and hashCode() metods for the `id` field
+
+
+
+#### ToString
+
+**Tips**: `alt+insert` implement toString( )
+
+
+
+### Spring Data Repositories
+
+Spring Data with JPA helps us implement repositories.
+
+Prevents us to write all this "ceremonial code" that JDBC needs.
+
+Create a new package `repositories`
+
+For each domain object create an `interface`.
+
+Example: `AuthorRepository.java`
+
+```java
+public interface AuthorRepository extends CrudRepository<Author, Long> { }
+```
+
+
 
-***Session 5 - 31/10/2022 : [Starts from here](https://sparkers.udemy.com/course/spring-framework-5-beginner-to-guru/learn/lecture/17792132#notes) Equality in hibernate***
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+Session 5 - 31/10/2022 : ended here
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