diff --git a/lesson-demo/pom.xml b/lesson-demo/pom.xml
index 80b50add..44b09aa4 100644
--- a/lesson-demo/pom.xml
+++ b/lesson-demo/pom.xml
@@ -11,4 +11,21 @@
 
     <artifactId>lesson-demo</artifactId>
 
+    <dependencies>
+        <dependency>
+            <groupId>jakarta.persistence</groupId>
+            <artifactId>jakarta.persistence-api</artifactId>
+            <version>3.1.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-core</artifactId>
+            <version>6.3.1.Final</version>
+        </dependency>
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <version>42.7.1</version>
+        </dependency>
+    </dependencies>
 </project>
\ No newline at end of file
diff --git a/lesson-demo/src/main/java/com/bobocode/DemoApp.java b/lesson-demo/src/main/java/com/bobocode/DemoApp.java
index 21d5205b..faa0c07a 100644
--- a/lesson-demo/src/main/java/com/bobocode/DemoApp.java
+++ b/lesson-demo/src/main/java/com/bobocode/DemoApp.java
@@ -1,7 +1,55 @@
 package com.bobocode;
 
+import com.bobocode.domain.Note;
+import com.bobocode.domain.Person;
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.Persistence;
+
+import java.util.function.Consumer;
+
 public class DemoApp {
+    private static EntityManagerFactory emf;
     public static void main(String[] args) {
+        emf = Persistence.createEntityManagerFactory("default");
+        var noteTitle = "A strange note 3";
         
+        doInTx(em ->{
+            var newNote = new Note();
+            newNote.setTitle(noteTitle);
+            newNote.setBody("I don't know who is my owner");
+
+            var mariana = em.find(Person.class, 230095);
+//            newNote.setPerson(mariana);
+            mariana.getNotes().add(newNote);
+            
+//            var serhii = em.find(Person.class, 230096);
+//            serhii.getNotes().add(newNote);
+//            serhii.addNote(newNote);
+            
+        });
+        
+        doInTx(em -> {
+            var note = em.createQuery("select n from Note n where n.title = ?1", Note.class)
+                    .setParameter(1, noteTitle)
+                    .getSingleResult();
+//            System.out.println(note.getPerson().getFirstName());
+        });
+        emf.close();
+    }
+    
+    private static void doInTx(Consumer<EntityManager> entityManagerConsumer) {
+        var em = emf.createEntityManager();
+        var tx = em.getTransaction();
+        try {
+            tx.begin();
+            entityManagerConsumer.accept(em);
+            tx.commit();
+        } catch (Exception e) {
+            tx.rollback();
+            throw e;
+        } finally {
+            em.close();
+        }
     }
 }
diff --git a/lesson-demo/src/main/java/com/bobocode/Task1DemoApp.java b/lesson-demo/src/main/java/com/bobocode/Task1DemoApp.java
new file mode 100644
index 00000000..aef440ca
--- /dev/null
+++ b/lesson-demo/src/main/java/com/bobocode/Task1DemoApp.java
@@ -0,0 +1,37 @@
+package com.bobocode;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.Persistence;
+
+import java.util.function.Consumer;
+
+public class Task1DemoApp {
+    private static EntityManagerFactory emf;
+
+    public static void main(String[] args) {
+        emf = Persistence.createEntityManagerFactory("default");
+
+        doInTx(em -> {
+
+        });
+
+
+        emf.close();
+    }
+
+    private static void doInTx(Consumer<EntityManager> entityManagerConsumer) {
+        var em = emf.createEntityManager();
+        var tx = em.getTransaction();
+        try {
+            tx.begin();
+            entityManagerConsumer.accept(em);
+            tx.commit();
+        } catch (Exception e) {
+            tx.rollback();
+            throw e;
+        } finally {
+            em.close();
+        }
+    }
+}
diff --git a/lesson-demo/src/main/java/com/bobocode/domain/Note.java b/lesson-demo/src/main/java/com/bobocode/domain/Note.java
new file mode 100644
index 00000000..3812dada
--- /dev/null
+++ b/lesson-demo/src/main/java/com/bobocode/domain/Note.java
@@ -0,0 +1,32 @@
+package com.bobocode.domain;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+
+import java.time.LocalDateTime;
+
+import static jakarta.persistence.GenerationType.SEQUENCE;
+
+@Entity
+@Table(name = "notes")
+@Setter
+@Getter
+public class Note {
+    @Id
+    @GeneratedValue(strategy = SEQUENCE, generator = "note_id_seq_generator")
+    @SequenceGenerator(name = "note_id_seq_generator", sequenceName = "notes_id_seq", allocationSize = 1)
+    private Integer id;
+
+    private String title;
+    
+    private String body;
+    
+    @CreationTimestamp
+    private LocalDateTime createdOn;
+
+    @ManyToOne(optional = false)
+    @JoinColumn(name = "person_id")
+    private Person person;
+}
diff --git a/lesson-demo/src/main/java/com/bobocode/domain/Person.java b/lesson-demo/src/main/java/com/bobocode/domain/Person.java
new file mode 100644
index 00000000..ec8c2ebb
--- /dev/null
+++ b/lesson-demo/src/main/java/com/bobocode/domain/Person.java
@@ -0,0 +1,52 @@
+package com.bobocode.domain;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+import org.hibernate.annotations.CreationTimestamp;
+import org.hibernate.annotations.JdbcType;
+import org.hibernate.dialect.PostgreSQLEnumJdbcType;
+
+import java.time.LocalDateTime;
+import java.util.ArrayList;
+import java.util.List;
+
+import static jakarta.persistence.CascadeType.ALL;
+import static jakarta.persistence.GenerationType.SEQUENCE;
+
+@Entity
+@Table(name = "persons")
+@Setter
+@Getter
+public class Person {
+    @Id
+    @GeneratedValue(strategy = SEQUENCE, generator = "person_id_seq_generator")
+    @SequenceGenerator(name = "person_id_seq_generator", sequenceName = "persons_id_seq", allocationSize = 1)
+    private Integer id;
+
+    @Column(nullable = false)
+    private String firstName;
+
+    @Column(nullable = false)
+    private String lastName;
+
+    @Enumerated(EnumType.STRING)
+    @JdbcType(PostgreSQLEnumJdbcType.class)
+    private TeamType team;
+
+    @CreationTimestamp
+    private LocalDateTime createdOn;
+
+    @OneToMany(mappedBy = "person", cascade = ALL)
+    private List<Note> notes = new ArrayList<>();
+
+    public enum TeamType {
+        Petros, Hoverla, Blyznytsia, Breskul, Svydovets
+    }
+
+
+    public void addNote(Note note) {
+        note.setPerson(this);
+        notes.add(note);
+    }
+}
diff --git a/lesson-demo/src/main/resources/META-INF/persistence.xml b/lesson-demo/src/main/resources/META-INF/persistence.xml
new file mode 100644
index 00000000..4e33ba96
--- /dev/null
+++ b/lesson-demo/src/main/resources/META-INF/persistence.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_1.xsd"
+             version="3.1">
+
+    <persistence-unit name="default">
+        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
+
+        <properties>
+            <property name="jakarta.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/postgres"/>
+            <property name="jakarta.persistence.jdbc.user" value="ju23user"/>
+            <property name="jakarta.persistence.jdbc.password" value="ju23pass"/>
+            <property name="jakarta.persistence.jdbc.driver" value="org.postgresql.Driver"/>
+            
+            <property name="hibernate.physical_naming_strategy"
+                      value="org.hibernate.boot.model.naming.CamelCaseToUnderscoresNamingStrategy"/>
+            <property name="hibernate.show_sql" value="true"/>
+        </properties>
+        
+    </persistence-unit>
+</persistence>
\ No newline at end of file