diff --git a/README.md b/README.md
index 4dace9f..1b8a183 100644
--- a/README.md
+++ b/README.md
@@ -5346,12 +5346,16 @@ It means they would eventually die and pods are unable to heal so it is recommen
 `kubectl delete pod pod_name`
 </b></details>
 
-#### Kubernetes Deployment
+#### Kubernetes - Deployment
 
 <details>
 <summary>What is a "Deployment" in Kubernetes?</summary><br><b>
 </b></details>
 
+<details>
+<summary>Describe the process of a deployment in high level</summary><br><b>
+</b></details>
+
 <details>
 <summary>How to create a deployment?</code></summary><br><b>
 
@@ -8444,7 +8448,7 @@ Logging<br>
 </b></details>
 
 <details>
-<summary>What is the different between infrastructure monitoring and application monitoring? (methods, tools, ...)</summary><br><b>
+<summary>What is the difference between infrastructure monitoring and application monitoring? (methods, tools, ...)</summary><br><b>
 </b></details>
 
 ## Prometheus
@@ -8453,6 +8457,12 @@ Logging<br>
 <summary>What is Prometheus? What are some of Prometheus's main features?</summary><br><b>
 </b></details>
 
+<details>
+<summary>In what scenarios it might be better to NOT use Prometheus?</summary><br><b>
+
+From Prometheus documentation: "if you need 100% accuracy, such as for per-request billing".
+</b></details>
+
 <details>
 <summary>Describe Prometheus architecture and components</summary><br><b>
 </b></details>
@@ -9056,6 +9066,12 @@ as key-value pair, document-oriented, etc.
 False. OpenShift is a PaaS (platform as a service) solution.
 </b></details>
 
+## OpenShift - Images
+
+<details>
+<summary>What is an image stream?</summary><br><b>
+</b></details>
+
 <details>
 <summary>What would be the best way to run and manage multiple OpenShift environments?</summary><br><b>
 
@@ -11836,7 +11852,7 @@ Also, data inconsistency is a concern with horizontal scaling.
 </b></details>
 
 <details>
-<summary>Explain when in which use cases will you use vertical scaling and in which use cases you will use horizontal scaling</summary><br><b>
+<summary>Explain in which use cases will you use vertical scaling and in which use cases you will use horizontal scaling</summary><br><b>
 </b></details>
 
 <details>
diff --git a/certificates/ckad.md b/certificates/ckad.md
new file mode 100644
index 0000000..75ddae5
--- /dev/null
+++ b/certificates/ckad.md
@@ -0,0 +1,31 @@
+## Certified Kubernetes Application Developer (CKAD)
+
+### Core Concepts
+
+### Pods
+
+<details>
+<summary>Deploy a pod called web-1985 using the nginx:alpine image</code></summary><br><b>
+
+`kubectl run web-1985 --image=nginx:alpine --restart=Never`
+</b></details>
+
+### Namespaces
+
+<details>
+<summary>List all namespaces</code></summary><br><b>
+
+kubectl get ns
+</b></details>
+
+<details>
+<summary>List all the pods in the namespace 'neverland'</code></summary><br><b>
+
+kubectl get ns -n neverland
+</b></details>
+
+<details>
+<summary>List all the pods in all the namespaces</code></summary><br><b>
+
+kubectl get po --all-namespaces
+</b></details>