diff --git a/CMakeLists.txt b/CMakeLists.txt
index a60f028d3..86b4b3baf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,6 +54,8 @@ else()
   set(LIBS )
 endif(WIN32)
 
+set(CMAKE_CXX_STANDARD 14)
+
 set(CHAPTERS
     1.getting_started
     2.lighting
@@ -62,6 +64,7 @@ set(CHAPTERS
     5.advanced_lighting
     6.pbr
     7.in_practice
+    8.guest
 )
 
 set(1.getting_started
@@ -166,6 +169,10 @@ set(7.in_practice
     #3.2d_game
 )
 
+set(8.guest
+    skeletal_animation
+)
+
 
 
 configure_file(configuration/root_directory.h.in configuration/root_directory.h)
diff --git a/includes/learnopengl/animator.h b/includes/learnopengl/animator.h
index 341ccb202..9d3bca5db 100644
--- a/includes/learnopengl/animator.h
+++ b/includes/learnopengl/animator.h
@@ -11,7 +11,7 @@
 class Animator
 {	
 public:
-	Animator::Animator(Animation* current)
+	Animator(Animation* current)
 	{
 		m_CurrentAnimation = current;
 		m_CurrentTime = 0.0;
@@ -20,7 +20,7 @@ class Animator
 			m_Transforms.push_back(glm::mat4(1.0f));
 	}
 
-	void Animator::UpdateAnimation(float dt)
+	void UpdateAnimation(float dt)
 	{
 		m_DeltaTime = dt;
 		if (m_CurrentAnimation)
@@ -31,13 +31,13 @@ class Animator
 		}
 	}
 
-	void Animator::PlayAnimation(Animation* pAnimation)
+	void PlayAnimation(Animation* pAnimation)
 	{
 		m_CurrentAnimation = pAnimation;
 		m_CurrentTime = 0.0f;
 	}
 
-	void Animator::CalculateBoneTransform(const AssimpNodeData* node, glm::mat4 parentTransform)
+	void CalculateBoneTransform(const AssimpNodeData* node, glm::mat4 parentTransform)
 	{
 		std::string nodeName = node->name;
 		glm::mat4 nodeTransform = node->transformation;
@@ -75,4 +75,4 @@ class Animator
 	float m_CurrentTime;
 	float m_DeltaTime;
 	
-};
\ No newline at end of file
+};
diff --git a/includes/learnopengl/assimp_glm_helpers.h b/includes/learnopengl/assimp_glm_helpers.h
index 960c1d938..6d8b3f2ce 100644
--- a/includes/learnopengl/assimp_glm_helpers.h
+++ b/includes/learnopengl/assimp_glm_helpers.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include<assimp/Quaternion.h>
+#include<assimp/quaternion.h>
 #include<assimp/vector3.h>
 #include<assimp/matrix4x4.h>
 #include<glm/glm.hpp>
@@ -31,4 +31,4 @@ class AssimpGLMHelpers
 	{
 		return glm::quat(pOrientation.w, pOrientation.x, pOrientation.y, pOrientation.z);
 	}
-};
\ No newline at end of file
+};
diff --git a/includes/learnopengl/bone.h b/includes/learnopengl/bone.h
index e562041b6..8e48b160d 100644
--- a/includes/learnopengl/bone.h
+++ b/includes/learnopengl/bone.h
@@ -160,7 +160,7 @@ class Bone
 
 	}
 
-	glm::mat4 Bone::InterpolateScaling(float animationTime)
+	glm::mat4 InterpolateScaling(float animationTime)
 	{
 		if (1 == m_NumScalings)
 			return glm::scale(glm::mat4(1.0f), m_Scales[0].scale);
diff --git a/includes/learnopengl/mesh.h b/includes/learnopengl/mesh.h
index 743a3bddb..18acfd6bd 100644
--- a/includes/learnopengl/mesh.h
+++ b/includes/learnopengl/mesh.h
@@ -12,6 +12,8 @@
 #include <vector>
 using namespace std;
 
+#define MAX_BONE_INFLUENCE 4
+
 struct Vertex {
     // position
     glm::vec3 Position;
@@ -23,6 +25,12 @@ struct Vertex {
     glm::vec3 Tangent;
     // bitangent
     glm::vec3 Bitangent;
+
+    //bone indexes which will influence this vertex
+    int m_BoneIDs[MAX_BONE_INFLUENCE];
+
+    //weights from each bone
+    float m_Weights[MAX_BONE_INFLUENCE];
 };
 
 struct Texture {
diff --git a/includes/learnopengl/model_animation.h b/includes/learnopengl/model_animation.h
index f1200f0bc..eda24e0a8 100644
--- a/includes/learnopengl/model_animation.h
+++ b/includes/learnopengl/model_animation.h
@@ -97,7 +97,7 @@ class Model
 
 	void SetVertexBoneDataToDefault(Vertex& vertex)
 	{
-		for (int i = 0; i < MAX_BONE_WEIGHTS; i++)
+		for (int i = 0; i < AI_MAX_BONE_WEIGHTS; i++)
 		{
 			vertex.m_BoneIDs[i] = -1;
 			vertex.m_Weights[i] = 0.0f;
@@ -154,7 +154,7 @@ class Model
 
 	void SetVertexBoneData(Vertex& vertex, int boneID, float weight)
 	{
-		for (int i = 0; i < MAX_BONE_WEIGHTS; ++i)
+		for (int i = 0; i < AI_MAX_BONE_WEIGHTS; ++i)
 		{
 			if (vertex.m_BoneIDs[i] < 0)
 			{
diff --git a/src/8.guest/2020/skeletal_animation/skeletal_animation.cpp b/src/8.guest/skeletal_animation/skeletal_animation.cpp
similarity index 100%
rename from src/8.guest/2020/skeletal_animation/skeletal_animation.cpp
rename to src/8.guest/skeletal_animation/skeletal_animation.cpp