diff --git a/best_practices.md b/best_practices.md
index 2ee462cba34902476a1e4f02f3a869643e48a54f..5b9c42ba0106e4682461db3cd7a67acf21a5a974 100644
--- a/best_practices.md
+++ b/best_practices.md
@@ -4,6 +4,7 @@
 * `pull` before `push`
 * Work on your **own** branch (in your own fork)
 * Do **not** `push` to `master` or `develop` (submit PR)
+* Get your code reviewed by submitted a PR
 * Do **not** combine `git` commands
 ```sh
 $ git commit -am "myMessage" # do not do this
diff --git a/branches.md b/branches.md
index 4cf120ff7cf7a69aa35ba99f3c1747ff84b3f64b..9cf292a55a81a6093e05e5e0400fbfaa18006de1 100644
--- a/branches.md
+++ b/branches.md
@@ -51,16 +51,13 @@ Only difference: you are on your own branch.
 
 ## Merge a branch
 
-If you want your feature on the `develop` or `master` branches, merge!
-
+If you want your feature on the `develop` or `master` branches,
 **submit a MR or a PR** via the Github/Gitlab interface.
 
+<br>
+Use the **interface** to make use of your peers to review your code!
+
 <img src="img/branch-merge.png" class="branch-merge" />
-<div class="fragment">
-**ADVANCED**: You can see the differences between branches
-```sh
-$ git diff master..matrix_vect_mult_myName
-```
 
 <br>
 You can delete the branch via the interface.
@@ -68,21 +65,21 @@ You can delete the branch via the interface.
 
 ## Gitlab interface
 
-Detailed information is [docs.gitlab.com/ee/gitlab-basics/add-merge-request.html](https://docs.gitlab.com/ee/gitlab-basics/add-merge-request.html).
+Detailed information is [docs.gitlab.com/ce/gitlab-basics/add-merge-request.html](https://docs.gitlab.com/ce/gitlab-basics/add-merge-request.html).
 
 1. Click on **New merge request**
 
-![alt text](https://docs.gitlab.com/ee/gitlab-basics/img/merge_request_new.png "New Merge Request")
+![New Merge Request](https://docs.gitlab.com/ee/gitlab-basics/img/merge_request_new.png)
 <br><br>
 2. Compare the branches
 
-![alt text](https://docs.gitlab.com/ee/gitlab-basics/img/merge_request_select_branch.png "Compare branches")
+![Compare branches](https://docs.gitlab.com/ee/gitlab-basics/img/merge_request_select_branch.png)
 
 
 <ol start="3">
   <li>Submit the MR
 
-  ![alt text](https://docs.gitlab.com/ee/gitlab-basics/img/merge_request_page.png "Submit MR")</li>
+  ![Submit MR](https://docs.gitlab.com/ee/gitlab-basics/img/merge_request_page.png)</li>
 </ol>
 
 
@@ -92,15 +89,15 @@ Detailed information is [help.github.com/articles/creating-a-pull-request/](http
 
 1. Click on **New pull request**
 
-![alt text](https://help.github.com/assets/images/help/pull_requests/pull-request-start-review-button.png "New pull request")
+![New pull request](https://help.github.com/assets/images/help/pull_requests/pull-request-start-review-button.png)
 <br><br>
 2. Compare the branches
 
-![alt text](https://help.github.com/assets/images/help/pull_requests/choose-base-and-compare-branches.png "Compare branches")
+![Compare branches](https://help.github.com/assets/images/help/pull_requests/choose-base-and-compare-branches.png)
 
 
 <ol start="3">
-  <li>Submit the MR
+  <li>Submit the PR
 
-  ![alt text](https://help.github.com/assets/images/help/pull_requests/pullrequest-send.png "Submit MR")</li>
+  ![Submit MR](https://help.github.com/assets/images/help/pull_requests/pullrequest-send.png)</li>
 </ol>
diff --git a/forks.md b/forks.md
index 3fc815cbb52a264033276b9d41d3a4f0a7ecda1c..2899290438d40fe9cbcb5ed00568b2ded2369fad 100644
--- a/forks.md
+++ b/forks.md
@@ -9,10 +9,11 @@ Remember:
 - A **fork** is not a **branch**, but can have multiple **branches**.
 
 
-## Fork on GitLab
+## Fork via interface
 
+Browse to the original repository and click on the button `Fork`:
 
-## Fork on GitHub
+![Fork the repo](https://help.github.com/assets/images/help/repository/fork_button.jpg)
 
 
 ## Clone your fork
diff --git a/github_gitlab.md b/github_gitlab.md
index 683c6757aefefc43902c85beb00301a3ce44c89b..ee7d8a57fee2e435fc3e08d4dbae884a2d0e4c8c 100644
--- a/github_gitlab.md
+++ b/github_gitlab.md
@@ -7,7 +7,10 @@ GitHub is **public**, whereas GitLab is **restricted/private**.
 Positive point: GitHub and GitLab are (almost) the same.
 
 
-## GitHub
+## GitHub (Live Demo)
 
 
-## GitLab
+## GitLab (Live Demo)
+
+
+## Open an issue (Live Demo)
diff --git a/installation.md b/installation.md
index b33ba488830d5789c9c3f25e1446c07b402ccae7..ec24784591a672b732d859ff0bbecb9bea84583b 100644
--- a/installation.md
+++ b/installation.md
@@ -55,7 +55,7 @@ $ git --version
 Test whether your username and email have been registered
 
 ```sh
-$ git config -l
+$ git config --list
 ```
 
 <br>