diff --git a/engine/Object.h b/engine/Object.h
index 929ec5a..68fb9f9 100644
--- a/engine/Object.h
+++ b/engine/Object.h
@@ -40,8 +40,8 @@ private:
 public:
     explicit Object(ObjectNameTag nameTag) : _nameTag(std::move(nameTag)) {};
     Object(const Object& object) : _nameTag(object.name()), _transformMatrix(object.model()) {};
-    
-    // TODO: implement rotations using quaternions
+
+    // TODO: implement rotations using quaternions (?)
     void transform(const Matrix4x4& t);
     void transformRelativePoint(const Vec3D &point, const Matrix4x4& transform);
     void translate(const Vec3D& dv);
diff --git a/engine/ResourceManager.cpp b/engine/ResourceManager.cpp
index 40f902b..ec3fcbc 100644
--- a/engine/ResourceManager.cpp
+++ b/engine/ResourceManager.cpp
@@ -16,6 +16,8 @@ bool ResourceManager::_validInstance = false;
 void ResourceManager::init() {
     _instance = new ResourceManager();
     _validInstance = true;
+
+    Log::log("ResourceManager::init(): resource manager was initialized");
 }
 
 void ResourceManager::unloadTextures() {
@@ -23,6 +25,9 @@ void ResourceManager::unloadTextures() {
         _texture.second.reset();
     }
     _instance->_textures.clear();
+
+    Log::log("ResourceManager::unloadTextures(): all textures was unloaded");
+
 }
 
 void ResourceManager::unloadSoundBuffers() {
@@ -30,6 +35,8 @@ void ResourceManager::unloadSoundBuffers() {
         _soundBuffer.second.reset();
     }
     _instance->_soundBuffers.clear();
+
+    Log::log("ResourceManager::unloadSoundBuffers(): all soundBuffers was unloaded");
 }
 
 void ResourceManager::unloadFonts() {
@@ -37,10 +44,14 @@ void ResourceManager::unloadFonts() {
         _font.second.reset();
     }
     _instance->_fonts.clear();
+
+    Log::log("ResourceManager::unloadFonts(): all fonts was unloaded");
 }
 
 void ResourceManager::unloadObjects() {
     _instance->_objects.clear();
+
+    Log::log("ResourceManager::unloadObjects(): all objects was unloaded");
 }
 
 void ResourceManager::unloadAllResources() {
@@ -52,12 +63,16 @@ void ResourceManager::unloadAllResources() {
     unloadSoundBuffers();
     unloadFonts();
     unloadObjects();
+
+    Log::log("ResourceManager::unloadAllResources(): all resources was unloaded");
 }
 
 void ResourceManager::free() {
     unloadAllResources();
     _validInstance = false;
     delete _instance;
+
+    Log::log("ResourceManager::free(): pointer to 'ResourceManager' was freed");
 }
 
 std::shared_ptr<sf::Texture> ResourceManager::loadTexture(const std::string& filename) {
@@ -74,9 +89,12 @@ std::shared_ptr<sf::Texture> ResourceManager::loadTexture(const std::string& fil
     // Otherwise - try to load it. If failure - return zero
     std::shared_ptr<sf::Texture> texture(new sf::Texture);
     if (!texture->loadFromFile(filename)) {
+        Log::log("ResourceManager::loadTexture: error with loading texture '" + filename + "'");
         return nullptr;
     }
 
+    Log::log("ResourceManager::loadTexture: texture '" + filename + "' was loaded");
+
     // If success - remember and return texture pointer
     texture->setRepeated(true);
     _instance->_textures.emplace(filename, texture);
@@ -98,9 +116,12 @@ std::shared_ptr<sf::SoundBuffer> ResourceManager::loadSoundBuffer(const std::str
     // Otherwise - try to load it. If failure - return zero
     std::shared_ptr<sf::SoundBuffer> soundBuffer(new sf::SoundBuffer);
     if (!soundBuffer->loadFromFile(filename)) {
+        Log::log("ResourceManager::loadSoundBuffer: error with loading sound buffer '" + filename + "'");
         return nullptr;
     }
 
+    Log::log("ResourceManager::loadSoundBuffer: sound buffer '" + filename + "' was loaded");
+
     // If success - remember and return sound pointer
     _instance->_soundBuffers.emplace(filename, soundBuffer);
 
@@ -121,9 +142,12 @@ std::shared_ptr<sf::Font> ResourceManager::loadFont(const std::string& filename)
     // Otherwise - try to load it. If failure - return zero
     std::shared_ptr<sf::Font> font(new sf::Font);
     if (!font->loadFromFile(filename)) {
+        Log::log("ResourceManager::loadFont: error with loading font: '" + filename + "'");
         return nullptr;
     }
 
+    Log::log("ResourceManager::loadFont: font '" + filename + "' was loaded");
+
     // If success - remember and return font pointer
     _instance->_fonts.emplace(filename, font);
 
@@ -147,7 +171,7 @@ std::vector<std::shared_ptr<Mesh>> ResourceManager::loadObjects(const std::strin
 
     std::ifstream file(filename);
     if (!file.is_open()) {
-        Log::log("Mesh::LoadObjects(): cannot load file from " + filename);
+        Log::log("Mesh::LoadObjects(): cannot load file from '" + filename + "'");
         return objects;
     }
 
@@ -204,6 +228,8 @@ std::vector<std::shared_ptr<Mesh>> ResourceManager::loadObjects(const std::strin
 
     file.close();
 
+    Log::log("Mesh::LoadObjects(): obj '" + filename + "' was loaded");
+
     // If success - remember and return vector of objects pointer
     _instance->_objects.emplace(filename, objects);
 
diff --git a/engine/SoundController.cpp b/engine/SoundController.cpp
index 86f085a..16c330c 100644
--- a/engine/SoundController.cpp
+++ b/engine/SoundController.cpp
@@ -4,6 +4,7 @@
 
 #include "SoundController.h"
 #include "ResourceManager.h"
+#include "utils/Log.h"
 
 SoundController* SoundController::_instance = nullptr;
 bool SoundController::_validInstance = false;
@@ -12,6 +13,8 @@ bool SoundController::_validInstance = false;
 void SoundController::init() {
     _instance = new SoundController();
     _validInstance = true;
+
+    Log::log("SoundController::init(): sound controller was initialized");
 }
 
 void SoundController::playSound(const SoundTag& soundTag, const std::string& filename) {
@@ -22,6 +25,8 @@ void SoundController::playSound(const SoundTag& soundTag, const std::string& fil
     stopSound(soundTag);
     _instance->_sounds.emplace(soundTag, sf::Sound(*ResourceManager::loadSoundBuffer(filename)));
     _instance->_sounds[soundTag].play();
+
+    Log::log("SoundController::playSound(): play sound '" + soundTag.str() + "'");
 }
 
 void SoundController::pauseSound(const SoundTag& soundTag) {
@@ -32,6 +37,8 @@ void SoundController::pauseSound(const SoundTag& soundTag) {
     if(_instance->_sounds.count(soundTag) > 0) {
         _instance->_sounds[soundTag].pause();
     }
+
+    Log::log("SoundController::pauseSound(): sound '" + soundTag.str() + "' was paused");
 }
 
 void SoundController::stopSound(const SoundTag& soundTag) {
@@ -43,6 +50,8 @@ void SoundController::stopSound(const SoundTag& soundTag) {
         _instance->_sounds[soundTag].stop();
     }
     _instance->_sounds.erase(soundTag);
+
+    Log::log("SoundController::stopSound(): sound '" + soundTag.str() + "' was stopped");
 }
 
 sf::Sound::Status SoundController::getStatus(const SoundTag& soundTag) {
@@ -61,11 +70,13 @@ sf::Sound::Status SoundController::getStatus(const SoundTag& soundTag) {
 void SoundController::free() {
     if(_validInstance) {
         for(auto& [soundTag, sound] : _instance->_sounds) {
-            sound.stop();
+            stopSound(soundTag);
         }
     }
 
     _instance->_sounds.clear();
     _validInstance = false;
     delete _instance;
+
+    Log::log("SoundController::free(): pointer to 'SoundController' was freed");
 }
diff --git a/engine/animation/Timeline.cpp b/engine/animation/Timeline.cpp
index bf498a5..5ec7cee 100644
--- a/engine/animation/Timeline.cpp
+++ b/engine/animation/Timeline.cpp
@@ -6,6 +6,7 @@
 #include "Animation.h"
 #include "Timeline.h"
 #include <iostream>
+#include "../utils/Log.h"
 
 Timeline* Timeline::_instance = nullptr;
 bool Timeline::_validInstance = false;
@@ -13,6 +14,8 @@ bool Timeline::_validInstance = false;
 void Timeline::init() {
     _instance = new Timeline();
     _validInstance = true;
+
+    Log::log("Timeline::init(): animation timeline was initialized");
 }
 
 void Timeline::animate(const AnimationListTag& listName, std::shared_ptr<Animation> anim) {
@@ -21,6 +24,8 @@ void Timeline::animate(const AnimationListTag& listName, std::shared_ptr<Animati
     }
 
     _instance->_animations[listName].emplace_back(anim);
+
+    Log::log("Timeline::animate(): add animation in '" + listName.str() + "' list");
 }
 
 void Timeline::deleteAllAnimations() {
@@ -28,10 +33,15 @@ void Timeline::deleteAllAnimations() {
         return;
     }
 
+    int animCounter = 0;
+
     for (auto& [listName, animationList] : _instance->_animations) {
+        animCounter += animationList.size();
         animationList.clear();
     }
     _instance->_animations.clear();
+
+    Log::log("Timeline::deleteAllAnimations(): all " + std::to_string(animCounter) + " animations was deleted" );
 }
 
 void Timeline::deleteAnimationList(const AnimationListTag& listName) {
@@ -39,8 +49,11 @@ void Timeline::deleteAnimationList(const AnimationListTag& listName) {
         return;
     }
 
+    int animCounter = _instance->_animations[listName].size();
     _instance->_animations[listName].clear();
     _instance->_animations.erase(listName);
+
+    Log::log("Timeline::deleteAnimationList(): list '" + listName.str() +"' with " + std::to_string(animCounter) + " animations was deleted" );
 }
 
 [[nodiscard]] bool Timeline::isInAnimList(const AnimationListTag& listName) {
@@ -87,4 +100,6 @@ void Timeline::free() {
     _validInstance = false;
 
     delete _instance;
+
+    Log::log("Timeline::free(): pointer to 'Timeline' was freed");
 }
diff --git a/engine/utils/Time.cpp b/engine/utils/Time.cpp
index dc63a05..623ebdc 100644
--- a/engine/utils/Time.cpp
+++ b/engine/utils/Time.cpp
@@ -4,6 +4,7 @@
 
 #include "Time.h"
 #include "../Consts.h"
+#include "Log.h"
 
 using namespace std::chrono;
 
@@ -13,6 +14,8 @@ bool Time::_validInstance = false;
 void Time::init() {
     _instance = new Time();
     _validInstance = true;
+
+    Log::log("Time::init(): time was initialized");
 }
 
 double Time::time() {
@@ -68,4 +71,6 @@ int Time::fps() {
 void Time::free() {
     _validInstance = false;
     delete _instance;
+
+    Log::log("Time::free(): pointer to 'Time' was freed");
 }