diff --git a/README.md b/README.md
index b2ea861..e0b31b8 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 :information_source:  This repository contains questions on various DevOps and SRE related topics
 
-:bar_chart:  There are currently **725** questions
+:bar_chart:  There are currently **726** questions
 
 :books:  To learn more about DevOps check the resources in [DevOpsBit.com](https://devopsbit.com)
 
@@ -78,8 +78,6 @@
 <details>
 <summary>What is DevOps?</summary><br><b>
 
-There are many good answers to this question.
-
 Amazon:
 
 "DevOps is the combination of cultural philosophies, practices, and tools that increases an organization’s ability to deliver applications and services at high velocity: evolving and improving products at a faster pace than organizations using traditional software development and infrastructure management processes. This speed enables organizations to better serve their customers and compete more effectively in the market."
@@ -111,10 +109,10 @@ Make sure to elaborate :)
 
 <details>
 <summary>What are the anti-patterns of DevOps?</summary><br><b>
-</b></details>
 
-<details>
-<summary>What is Reliability? How does it fit DevOps?</summary><br><b>
+* Now allowing to push in production on Friday :)
+* One specific person is in charge of different tasks. For example there is only one person who is allowed to merge the code of everyone else
+* Treating production differently from development environment. For example, not implementing security in development environment
 </b></details>
 
 <details>
@@ -230,6 +228,10 @@ It can be as simple as one Ansible (or other CM tool) task that runs periodicall
 <summary>Compare SRE to DevOps</summary><br><b>
 </b></details>
 
+<details>
+<summary>What is Reliability? How does it fit DevOps?</summary><br><b>
+</b></details>
+
 <details>
 <summary>What SRE team is responsible for?</summary><br><b>
 
@@ -2541,6 +2543,7 @@ Statements are instructions executed by the interpreter like variable assignment
 
 <details>
 <summary>Binary search:
+
   * How it works?
   * Can you implement it? (in any language you prefer)
   * What is the average performance of the algorithm you wrote?</summary><br><b>
@@ -2561,8 +2564,8 @@ The average performance of the above algorithm is O(log n). Best performance can
 <details>
 <summary>Do you agree/disagree with each of the following statements and why?:
 
-  * The commit message is not important. When reviewing a change/patch one should focus on the actual change</summary><br><b>
-  * You shouldn't test your code before submitting it. This is what CI/CD exists for.
+  * The commit message is not important. When reviewing a change/patch one should focus on the actual change
+  * You shouldn't test your code before submitting it. This is what CI/CD exists for.</summary><br><b>
 </b></details>
 
 #### Strings
@@ -3105,6 +3108,12 @@ def reverse_string(string):
 ```
 </b></details>
 
+<details>
+<summary>What is the output of the following code: <code>"".join(["a", "h", "m", "a", "h", "a", "n", "q", "r", "l", "o", "i", "f", "o", "o"])[2::3]</code></summary><br><b>
+
+mario
+</b></details>
+
 <details>
 <summary>Explain data serialization and how do you perform it with Python</summary><br><b>
 </b></details>
diff --git a/common-qa.md b/common-qa.md
index d09ddfb..b65c861 100644
--- a/common-qa.md
+++ b/common-qa.md
@@ -89,6 +89,7 @@ Personally, I really like the following sites
 
 * [HackerRank](https://www.hackerrank.com)
 * [LeetCode](https://leetcode.com)
+* [Exercism](https://exercism.io)
 
 ### How to learn more about Linux?
 
diff --git a/prepare_for_interview.md b/prepare_for_interview.md
index dcbaa74..4f3f9a7 100644
--- a/prepare_for_interview.md
+++ b/prepare_for_interview.md
@@ -19,6 +19,7 @@ I recommend the following sites for practicing coding:
 
 * [HackerRank](https://www.hackerrank.com)
 * [LeetCode](https://leetcode.com)
+* [Exercism](https://exercism.io)
 
 #### Architecture and Design