diff --git a/src/main/java/com/javanauta/ts/taskscheduler/business/TaskService.java b/src/main/java/com/javanauta/ts/taskscheduler/business/TaskService.java
index 06ac2e3..7c645f5 100644
--- a/src/main/java/com/javanauta/ts/taskscheduler/business/TaskService.java
+++ b/src/main/java/com/javanauta/ts/taskscheduler/business/TaskService.java
@@ -5,11 +5,12 @@
 import com.javanauta.ts.taskscheduler.business.mapper.TaskUpdateConverter;
 import com.javanauta.ts.taskscheduler.infrastructure.entity.Task;
 import com.javanauta.ts.taskscheduler.infrastructure.enums.NotificationStatusEnum;
-import com.javanauta.ts.taskscheduler.infrastructure.exception.InvalidTimeZoneException;
+import com.javanauta.ts.taskscheduler.infrastructure.exception.ValidationErrorException;
 import com.javanauta.ts.taskscheduler.infrastructure.exception.ResourceNotFoundException;
 import com.javanauta.ts.taskscheduler.infrastructure.repository.TaskRepository;
 import com.javanauta.ts.taskscheduler.infrastructure.security.JwtUtil;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.stereotype.Service;
 
 import java.time.Instant;
@@ -18,6 +19,7 @@
 
 @Service
 @RequiredArgsConstructor
+@Slf4j
 public class TaskService {
 
     private final TaskRepository taskRepository;
@@ -31,14 +33,15 @@ public TaskDTO saveTask(String token, TaskDTO taskDTO) {
         taskDTO.setNotificationStatusEnum(NotificationStatusEnum.PENDING);
         validateTimeZoneId(taskDTO.getTimeZoneId());
 
-        Task task = taskConverter.toTask(taskDTO);
+        Task savedTask = taskRepository.save(taskConverter.toTask(taskDTO));
+        log.info("Task {} created", savedTask.getId());
 
-        return taskConverter.toTaskDTO(taskRepository.save(task));
+        return taskConverter.toTaskDTO(savedTask);
     }
 
     private void validateTimeZoneId(String timeZoneId) {
         if (!ZoneId.getAvailableZoneIds().contains(timeZoneId)) {
-            throw new InvalidTimeZoneException("Invalid time zone ID: " + timeZoneId);
+            throw new ValidationErrorException("Invalid time zone ID");
         }
     }
 
@@ -47,32 +50,40 @@ public List<TaskDTO> findTaskByTimePeriod(Instant initialDateTime, Instant final
     }
 
     public List<TaskDTO> findTaskByUserEmail(String token) {
+        // Assumes the user exists as it's being extracted from the token
         return taskConverter.toTaskDTOList(taskRepository.findByUserEmail(jwtUtil.extractUsername(token.substring(7))));
     }
 
     public void deleteTaskById(String id) {
         if (taskRepository.existsById(id)) {
             taskRepository.deleteById(id);
+            log.info("Task {} deleted", id);
         } else {
-            throw new ResourceNotFoundException(String.format("Task with ID '%s' not found.", id));
+            throw new ResourceNotFoundException("Task not found");
         }
     }
 
     public TaskDTO modifyTaskStatusById (NotificationStatusEnum notificationStatusEnum, String id) {
-        Task task = taskRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException(String.format("Task with ID '%s' not found.", id)));
+        Task task = taskRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException("Task not found"));
         task.setNotificationStatusEnum(notificationStatusEnum);
         task.setModificationDateTime(Instant.now());
 
-        return taskConverter.toTaskDTO(taskRepository.save(task));
+        Task updatedTask = taskRepository.save(task);
+        log.info("Status of task {} updated", updatedTask.getId());
+
+        return taskConverter.toTaskDTO(updatedTask);
     }
 
     public TaskDTO updateTaskById (TaskDTO taskDTO, String id) {
-        Task task = taskRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException(String.format("Task with ID '%s' not found.", id)));
+        Task task = taskRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException("Task not found"));
 
         taskUpdateConverter.updateTasks(taskDTO, task);
         validateTimeZoneId(task.getTimeZoneId());
         task.setModificationDateTime(Instant.now());
 
-        return taskConverter.toTaskDTO(taskRepository.save(task));
+        Task updatedTask = taskRepository.save(task);
+        log.info("Task {} updated", updatedTask.getId());
+
+        return taskConverter.toTaskDTO(updatedTask);
     }
 }
diff --git a/src/main/java/com/javanauta/ts/taskscheduler/controller/GlobalExceptionHandler.java b/src/main/java/com/javanauta/ts/taskscheduler/controller/GlobalExceptionHandler.java
index 9d8693a..286d287 100644
--- a/src/main/java/com/javanauta/ts/taskscheduler/controller/GlobalExceptionHandler.java
+++ b/src/main/java/com/javanauta/ts/taskscheduler/controller/GlobalExceptionHandler.java
@@ -1,28 +1,36 @@
 package com.javanauta.ts.taskscheduler.controller;
 
-import com.javanauta.ts.taskscheduler.infrastructure.exception.InvalidTimeZoneException;
+import com.javanauta.ts.taskscheduler.infrastructure.exception.ValidationErrorException;
 import com.javanauta.ts.taskscheduler.infrastructure.exception.ResourceNotFoundException;
-import com.javanauta.ts.taskscheduler.infrastructure.exception.UnauthorizedException;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 
 @ControllerAdvice
+@Slf4j
 public class GlobalExceptionHandler {
 
+    // business exceptions
+
     @ExceptionHandler(ResourceNotFoundException.class)
     public ResponseEntity<String> handlerResourceNotFoundException(ResourceNotFoundException ex) {
-        return new ResponseEntity<>(ex.getMessage(), HttpStatus.NOT_FOUND);
+        log.warn("Resource not found exception: {}", ex.getMessage());
+        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ex.getMessage());
     }
 
-    @ExceptionHandler(UnauthorizedException.class)
-    public ResponseEntity<String> handlerUnauthorizedException(UnauthorizedException ex) {
-        return new ResponseEntity<>(ex.getMessage(), HttpStatus.UNAUTHORIZED);
+    @ExceptionHandler(ValidationErrorException.class)
+    public ResponseEntity<String> handlerValidationErrorException(ValidationErrorException ex) {
+        log.warn("Invalid value exception: {}", ex.getMessage());
+        return ResponseEntity.status(HttpStatus.UNPROCESSABLE_CONTENT).body(ex.getMessage());
     }
 
-    @ExceptionHandler(InvalidTimeZoneException.class)
-    public ResponseEntity<String> handlerInvalidTimeZoneId(InvalidTimeZoneException ex) {
-        return new ResponseEntity<>(ex.getMessage(), HttpStatus.BAD_REQUEST);
+    // Generic error handling
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<String> handleGenericException(Exception ex) {
+        log.error("Unhandled exception", ex);
+        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("Internal server error");
     }
 }
diff --git a/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/InvalidTimeZoneException.java b/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/InvalidTimeZoneException.java
deleted file mode 100644
index 067eab1..0000000
--- a/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/InvalidTimeZoneException.java
+++ /dev/null
@@ -1,10 +0,0 @@
-package com.javanauta.ts.taskscheduler.infrastructure.exception;
-
-public class InvalidTimeZoneException extends RuntimeException {
-    public InvalidTimeZoneException(String message) {
-        super(message);
-    }
-    public InvalidTimeZoneException(String message, Throwable throwable) {
-        super(message, throwable);
-    }
-}
diff --git a/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/UnauthorizedException.java b/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/UnauthorizedException.java
deleted file mode 100644
index 1cd3323..0000000
--- a/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/UnauthorizedException.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.javanauta.ts.taskscheduler.infrastructure.exception;
-
-import org.springframework.security.core.AuthenticationException;
-
-public class UnauthorizedException extends AuthenticationException {
-    public UnauthorizedException(String message) {
-        super(message);
-    }
-
-    public UnauthorizedException(String message, Throwable throwable) {
-        super(message, throwable);
-    }
-}
diff --git a/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/ValidationErrorException.java b/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/ValidationErrorException.java
new file mode 100644
index 0000000..9a9ab39
--- /dev/null
+++ b/src/main/java/com/javanauta/ts/taskscheduler/infrastructure/exception/ValidationErrorException.java
@@ -0,0 +1,10 @@
+package com.javanauta.ts.taskscheduler.infrastructure.exception;
+
+public class ValidationErrorException extends RuntimeException {
+    public ValidationErrorException(String message) {
+        super(message);
+    }
+    public ValidationErrorException(String message, Throwable throwable) {
+        super(message, throwable);
+    }
+}