diff --git a/02_end_to_end_machine_learning_project.ipynb b/02_end_to_end_machine_learning_project.ipynb
index 4076adb..6299335 100644
--- a/02_end_to_end_machine_learning_project.ipynb
+++ b/02_end_to_end_machine_learning_project.ipynb
@@ -6329,7 +6329,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Great! It seems that we had the right imputer stragegy (mean), and apparently only the top 7 features are useful (out of 9), the last 2 seem to just add some noise."
+    "Great! It seems that we had the right imputer strategy (mean), and apparently only the top 7 features are useful (out of 9), the last 2 seem to just add some noise."
    ]
   },
   {
diff --git a/03_classification.ipynb b/03_classification.ipynb
index f83d4be..0b255fc 100644
--- a/03_classification.ipynb
+++ b/03_classification.ipynb
@@ -6,7 +6,7 @@
    "source": [
     "**Chapter 3 – Classification**\n",
     "\n",
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 3._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 3._"
    ]
   },
   {
diff --git a/04_training_linear_models.ipynb b/04_training_linear_models.ipynb
index 18452a0..f42c955 100644
--- a/04_training_linear_models.ipynb
+++ b/04_training_linear_models.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 4._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 4._"
    ]
   },
   {
diff --git a/05_support_vector_machines.ipynb b/05_support_vector_machines.ipynb
index b0eef26..1f1cb7b 100644
--- a/05_support_vector_machines.ipynb
+++ b/05_support_vector_machines.ipynb
@@ -9,7 +9,7 @@
    "source": [
     "**Chapter 5 – Support Vector Machines**\n",
     "\n",
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 5._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 5._"
    ]
   },
   {
diff --git a/06_decision_trees.ipynb b/06_decision_trees.ipynb
index 2e36cea..016aa7a 100644
--- a/06_decision_trees.ipynb
+++ b/06_decision_trees.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 6._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 6._"
    ]
   },
   {
diff --git a/07_ensemble_learning_and_random_forests.ipynb b/07_ensemble_learning_and_random_forests.ipynb
index 61e8e6b..78878af 100644
--- a/07_ensemble_learning_and_random_forests.ipynb
+++ b/07_ensemble_learning_and_random_forests.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 7._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 7._"
    ]
   },
   {
diff --git a/08_dimensionality_reduction.ipynb b/08_dimensionality_reduction.ipynb
index 287e3b6..7d6e769 100644
--- a/08_dimensionality_reduction.ipynb
+++ b/08_dimensionality_reduction.ipynb
@@ -11,7 +11,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 8._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 8._"
    ]
   },
   {
diff --git a/09_up_and_running_with_tensorflow.ipynb b/09_up_and_running_with_tensorflow.ipynb
index 47cc3ac..9ecf9df 100644
--- a/09_up_and_running_with_tensorflow.ipynb
+++ b/09_up_and_running_with_tensorflow.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 9._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 9._"
    ]
   },
   {
diff --git a/10_introduction_to_artificial_neural_networks.ipynb b/10_introduction_to_artificial_neural_networks.ipynb
index b187c51..75b5d6e 100644
--- a/10_introduction_to_artificial_neural_networks.ipynb
+++ b/10_introduction_to_artificial_neural_networks.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 10._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 10._"
    ]
   },
   {
diff --git a/11_deep_learning.ipynb b/11_deep_learning.ipynb
index 314d9de..c0746e0 100644
--- a/11_deep_learning.ipynb
+++ b/11_deep_learning.ipynb
@@ -11,7 +11,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 11._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 11._"
    ]
   },
   {
diff --git a/12_distributed_tensorflow.ipynb b/12_distributed_tensorflow.ipynb
index 2dd3c99..30997f2 100644
--- a/12_distributed_tensorflow.ipynb
+++ b/12_distributed_tensorflow.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 12._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 12._"
    ]
   },
   {
diff --git a/13_convolutional_neural_networks.ipynb b/13_convolutional_neural_networks.ipynb
index 87e61e3..e0888fb 100644
--- a/13_convolutional_neural_networks.ipynb
+++ b/13_convolutional_neural_networks.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 13._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 13._"
    ]
   },
   {
diff --git a/14_recurrent_neural_networks.ipynb b/14_recurrent_neural_networks.ipynb
index e075517..add5ea2 100644
--- a/14_recurrent_neural_networks.ipynb
+++ b/14_recurrent_neural_networks.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 14._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 14._"
    ]
   },
   {
diff --git a/15_autoencoders.ipynb b/15_autoencoders.ipynb
index d423d07..8a80de7 100644
--- a/15_autoencoders.ipynb
+++ b/15_autoencoders.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "_This notebook contains all the sample code and solutions to the exercices in chapter 15._"
+    "_This notebook contains all the sample code and solutions to the exercises in chapter 15._"
    ]
   },
   {
diff --git a/16_reinforcement_learning.ipynb b/16_reinforcement_learning.ipynb
index 609f2eb..2ddc225 100644
--- a/16_reinforcement_learning.ipynb
+++ b/16_reinforcement_learning.ipynb
@@ -17,7 +17,7 @@
     "editable": true
    },
    "source": [
-    "This notebook contains all the sample code and solutions to the exercices in chapter 16."
+    "This notebook contains all the sample code and solutions to the exercises in chapter 16."
    ]
   },
   {