diff --git a/.gitignore b/.gitignore
index 58134cd7..c8d0a7f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 .DS_Store
-./04-instructors/lessons/pdf/*
-./04-instructors/lessons/html/*
+./04_instructors/lessons/pdf/*
+./04_instructors/lessons/html/*
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diff --git a/04-instructors/README.md b/04_instructors/README.md
similarity index 90%
rename from 04-instructors/README.md
rename to 04_instructors/README.md
index cdf8ff5a..23472269 100644
--- a/04-instructors/README.md
+++ b/04_instructors/README.md
@@ -1,7 +1,7 @@
 # Instructor Playbook
 
 ## How do you interact with the repo?
-The Technical Facilitator will teach using the content provided in the `/01-slides` directory. You are allowed to live code with them during your lecture. Just make sure you upload the live-coding files to a new directory called `/live-coding` under `/01-slides` to this repository using a new branch and open up a pull request for it to be merge.
+The Technical Facilitator will teach using the content provided in the `/01_slides` directory. You are allowed to live code with them during your lecture. Just make sure you upload the live-coding files to a new directory called `/live-coding` under `/01_slides` to this repository using a new branch and open up a pull request for it to be merge.
 
 ## How does the module flow?
 The module is organized into 3 main directories:
@@ -9,11 +9,11 @@ The module is organized into 3 main directories:
 2. Assignments
 3. Homework
 
-The `/01-slides` directory would be the first directory anyone would see, and contains the lecture slides, learning outcomes, and anything related to the learning outcomes such as live-coding files.
+The `/01_slides` directory would be the first directory anyone would see, and contains the lecture slides, learning outcomes, and anything related to the learning outcomes such as live-coding files.
 
-The `/02-assignments` directory is the second directory containing the assignments that would be marked as a `pass` or `fail`. Compared to `/03-homework`, the assignments are slightly more difficult, and helps encapsulates the learnings for the week. All assignments are mandatory to complete and deliver.
+The `/02_assignments` directory is the second directory containing the assignments that would be marked as a `pass` or `fail`. Compared to `/03_homework`, the assignments are slightly more difficult, and helps encapsulates the learnings for the week. All assignments are mandatory to complete and deliver.
 
-The `/03-homework` directory contains all the homework, a learner can do to demonstrate mastery of the learning contents. Unlike the `/02-assignments` directory, all homework is optional, but is highly encouraged to attempt.
+The `/03_homework` directory contains all the homework, a learner can do to demonstrate mastery of the learning contents. Unlike the `/02_assignments` directory, all homework is optional, but is highly encouraged to attempt.
 
 ### Week 1
 
diff --git a/04-instructors/.dsi-certificates-theme.css b/04_instructors/dsi_certificates_theme.css
similarity index 90%
rename from 04-instructors/.dsi-certificates-theme.css
rename to 04_instructors/dsi_certificates_theme.css
index 6b7cc199..7d4f43a3 100644
--- a/04-instructors/.dsi-certificates-theme.css
+++ b/04_instructors/dsi_certificates_theme.css
@@ -1,5 +1,5 @@
-/* dsi-certificates-theme.css */
-/* @theme dsi-certificates-theme */
+/* dsi_certificates_theme.css */
+/* @theme dsi_certificates_theme */
 
 @import 'uncover';
 
diff --git a/04-instructors/generate_slides.sh b/04_instructors/generate_slides.sh
similarity index 98%
rename from 04-instructors/generate_slides.sh
rename to 04_instructors/generate_slides.sh
index 8f61b7e1..594f16f7 100755
--- a/04-instructors/generate_slides.sh
+++ b/04_instructors/generate_slides.sh
@@ -2,7 +2,7 @@
 
 # CONFIGURATION
 folder_md="lessons/"
-folder_output="../01-slides" # This will be used for both PDF and HTML
+folder_output="../01_slides" # This will be used for both PDF and HTML
 
 # Clear the screen for the splash screen
 clear
diff --git a/04-instructors/lessons/optional_unix_slides.md b/04_instructors/lessons/optional_unix_slides.md
similarity index 99%
rename from 04-instructors/lessons/optional_unix_slides.md
rename to 04_instructors/lessons/optional_unix_slides.md
index 8626c59f..c0411a26 100644
--- a/04-instructors/lessons/optional_unix_slides.md
+++ b/04_instructors/lessons/optional_unix_slides.md
@@ -1,6 +1,6 @@
 ---
 marp: true
-theme: dsi-certificates-theme
+theme: dsi_certificates_theme
 _class: invert
 paginate: true
 ---
diff --git a/04-instructors/lessons/unix_slides.md b/04_instructors/lessons/unix_slides.md
similarity index 99%
rename from 04-instructors/lessons/unix_slides.md
rename to 04_instructors/lessons/unix_slides.md
index 8cd7455d..cb0ab49c 100644
--- a/04-instructors/lessons/unix_slides.md
+++ b/04_instructors/lessons/unix_slides.md
@@ -1,6 +1,6 @@
 ---
 marp: true
-theme: dsi-certificates-theme
+theme: dsi_certificates_theme
 _class: invert
 paginate: true
 ---
diff --git a/README.md b/README.md
index 3eee3181..6dc5973c 100644
--- a/README.md
+++ b/README.md
@@ -84,7 +84,7 @@ Feel free to use the following as resources:
 - [Bash in 100 seconds](https://www.youtube.com/watch?v=I4EWvMFj37g)
 
 ### How to get help
-![image](/steps-to-ask-for-help.png)
+![image](/steps_to_ask_for_help.png)
 
 <hr>
 
@@ -92,13 +92,13 @@ Feel free to use the following as resources:
 Below is an outline of the folder structure for this module:
 ```markdown
 .
-├── 01-slides
-├── 02-assignments
-├── 03-homework
-├── 04-instructors
+├── 01_slides
+├── 02_assignments
+├── 03_homework
+├── 04_instructors
 ├── LICENSE
 ├── README.md
-└── steps-to-ask-for-help.png
+└── steps_to_ask_for_help.png
 ```
 
 * **slides:** Course slides as PDF files.
diff --git a/steps-to-ask-for-help.png b/steps_to_ask_for_help.png
similarity index 100%
rename from steps-to-ask-for-help.png
rename to steps_to_ask_for_help.png