diff --git a/README.md b/README.md
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+++ b/README.md
@@ -1 +1,125 @@
-# merge-vs-rebase
+# Intro
+
+blabla
+
+## Fork
+
+Fork this repo to your own github repo
+
+# Ex. 1 - python
+
+Here is the output of a python application:
+
+```bash
+$ python run.py 'Hello buddies'
+ _   _        _  _          _                 _      _  _            
+| | | |  ___ | || |  ___   | |__   _   _   __| |  __| |(_)  ___  ___ 
+| |_| | / _ \| || | / _ \  | '_ \ | | | | / _` | / _` || | / _ \/ __|
+|  _  ||  __/| || || (_) | | |_) || |_| || (_| || (_| || ||  __/\__ \
+|_| |_| \___||_||_| \___/  |_.__/  \__,_| \__,_| \__,_||_| \___||___/
+
+```
+
+Can you write the run.py application and put it in the ex1 folder of the repo?
+
+# Ex. 2 - docker
+
+In ex2 folder, you will find a `plik` binary (taken from https://plik.ovh).
+
+Can you build very lighweight docker image that contains ONLY `plik` binary, and that execute `plik` by default?
+
+Push your Dockerfile in the ex2 folder.
+
+# Ex. 3 - terraform
+
+In ex3 folder, you will find an incomplete `openrc` file.
+
+You will need to amend the file to configure the correct `OS_USERNAME`, `OS_PASSWORD` and `OS_REGION_NAME` with the one that we gave to you.
+
+Then, using `terraform`, can you write a plan to boot a `d2-4` with a floating IP.
+
+Bonus, on that instance, make sure a web server (`nginx`) is running.
+
+Push your `main.tf` file in ex3 folder.
+
+
+# Ex. 4 - git
+
+In this repo, there are two branches:
+ * stein
+ * queens
+
+Stein contains the following commits:
+
+ * 1ff2641 (stein) G
+ * cf24853 F
+ * 3fcdfa0 E
+ * cb8c71a D
+ * 849ef26 C
+ * 372c155 B
+ * edc8ed7 A
+
+Queens contains the following commits:
+
+ * 2624c16 (queens) F
+ * 5e3521b B
+ * edc8ed7 A
+
+So the common ancestor is A (same commit ID).
+
+B has been cherry-picked from stein to queens, without conflicts.
+
+F has also been cherry-picked but with conflicts (solved, of course).
+
+## Exercice
+
+You will need to create two branches:
+ - merged
+ - rebased
+
+### Merged
+
+Create the merged branch first:
+
+```bash
+git checkout -b merged origin/queens
+```
+
+Then merge the stein branch into your branch
+```bash
+git merge origin/stein
+```
+
+You will have a conflict to solved.
+
+Solve it, then push your `merged` branch to your repo.
+
+
+### Rebased
+
+Now create the rebased branch:
+```bash
+git checkout -b rebased origin/queens
+```
+
+Now rebase it on top of stein:
+
+```bash
+git rebase -i origin/stein
+```
+
+You will have a conflict to solved.
+
+Solve it, then push your `rebased` branch to your repo.
+
+## Check diff
+
+Now check the diff between your two branches `merged` and `rebased`.
+
+```bash
+git diff merged..rebased
+```
+
+Can you explain why you have a diff?
+
+Write down the explanation in ex4 folder (like in a `README.md` file)
diff --git a/ex1/.placeholder b/ex1/.placeholder
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diff --git a/ex2/.placeholder b/ex2/.placeholder
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diff --git a/ex3/.placeholder b/ex3/.placeholder
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diff --git a/ex3/openrc b/ex3/openrc
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+export OS_AUTH_URL=https://auth.cloud.ovh.net/v3
+export OS_IDENTITY_API_VERSION=3
+export OS_USER_DOMAIN_NAME="Default"
+export OS_PROJECT_DOMAIN_NAME="Default"
+export OS_TENANT_ID=fc00ee5431d4497681f2039f4e649dca
+export OS_TENANT_NAME="3245829148481055"
+export OS_USERNAME="REPLACE_ME"
+export OS_PASSWORD="REPLACE_ME"
+export OS_REGION_NAME="GRA7"
diff --git a/ex4/.placeholder b/ex4/.placeholder
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