diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000000000000000000000000000000000000..cb982f00b6294f263cec394495de886cb5af440c
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,9 @@
+watch_file flake.nix
+watch_file flake.lock
+
+DEVENV_ROOT_FILE="$(mktemp)"
+printf %s "$PWD" > "$DEVENV_ROOT_FILE"
+if ! use flake . --override-input devenv-root "file+file://$DEVENV_ROOT_FILE"
+then
+  echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
+fi
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000000000000000000000000000000000..f6d3039f188cbc05ec48c98e247ee7ed7a12c31e
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+ligne_de_commande_logo.png filter=lfs diff=lfs merge=lfs -text
+R_logo.png filter=lfs diff=lfs merge=lfs -text
+VS_code_logo.png filter=lfs diff=lfs merge=lfs -text
diff --git a/.gitignore b/.gitignore
index d2e99add758353effc952294152ba7ec22d34909..b0567325ca6eed80e61ad21417f585aa79efc07f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ public/*.png
 session_1_quarto_files/
 *.swp
 .vscode
+.devenv
diff --git a/01_initiation/3_a_quoi_sert_git.qmd b/01_initiation/3_a_quoi_sert_git.qmd
index 033c4b7f95edd4c5972a1dedba0417316545037e..8df9ee825d4c8cffc019a32228a3425e3ccf265d 100644
--- a/01_initiation/3_a_quoi_sert_git.qmd
+++ b/01_initiation/3_a_quoi_sert_git.qmd
@@ -4,18 +4,34 @@
 
 ![](images/version_doc.jpg){fig-align="center"}
 
+::: notes 
+Ça vous est sans doute déjà arrivé de garder plusieurs versions de documents ou de scripts.
+-> versionnage manuel
+:::
+
 ## À quoi sert Git ?
 
 * Suivi et sauvegarde des changements dans le code
-* Mise à disposition / partage
-* Mise en place des outillages logiciels (vérifications automatiques, empaquetage…)
 
+![](images/03_01_a_quoi_sert_git_versionnage.png){fig-align="center"}
+
+::: notes
+De manière générale, git sert à enregistrer des versions de son code source. 
+On va l’utiliser dès qu’on fait une modification.
+:::
 
 ## Bénéfices en général
 
 * Traçabilité des modifications
 * Retour à une version antérieure, reproductibilité
+* Mise à disposition, partage
 * Synchronisation entre plusieurs postes, accessibilité
 * Copie de travail locale (pour un travail hors ligne)
 * Travail sur des questions en parallèle
+* Associé à une forge: mise en place d’outillage logiciel (vérifications automatiques, empaquetage)
+
 
+::: notes
+reproductibilité : permettre de relancer un programme ou un script associé à des données exactement dans les mêmes conditions que celles dans lesquelles ces données ont été générées
+partage : permet donc de partager des données, mais aussi la manière exacte dont ces donées ont été générées
+:::
diff --git a/01_initiation/4_cas_d_utilisation.qmd b/01_initiation/4_cas_d_utilisation.qmd
index f3e6c08dd987e1c3a7c37ca60ae7f42fe84cd8a1..9d6f412fd7787d463d3c383d7234f0877f269447 100644
--- a/01_initiation/4_cas_d_utilisation.qmd
+++ b/01_initiation/4_cas_d_utilisation.qmd
@@ -1,5 +1,9 @@
 # Cas d'utilisation {.inverse}
 
+::: notes
+présentation des cas d’utilisation abordés dans cette session
+:::
+
 ----
 
 Pourquoi aurait-on besoin de Git ?
@@ -12,4 +16,4 @@ Pourquoi aurait-on besoin de Git ?
 
 ::: notes
 Cas d'utilisations abordés dans cette session
-:::
\ No newline at end of file
+:::
diff --git a/01_initiation/5_etats.qmd b/01_initiation/5_etats.qmd
index 1ad3d88bffeb38eb50b585c0b8241e2bd484617b..5b419da7c478b50a7cc3ba8ec1be17850eb7e174 100644
--- a/01_initiation/5_etats.qmd
+++ b/01_initiation/5_etats.qmd
@@ -1,5 +1,9 @@
 # États {.inverse}
 
+::: notes
+États d’un répertoire de travail
+:::
+
 ----
 
 Les états du système de fichiers
@@ -7,6 +11,12 @@ Les états du système de fichiers
 ![](images/etats.png){fig-align="center"}
 
 
+::: notes
+Le répertoire et les fichiers suvis vont être dans différents états (ne pas détailler)
+pour cette session, va s’intéresser à une petite partie de ces états
+:::
+
+
 ## États (session 1)
 
 ![](images/etats_session1.png){fig-align="center"}
diff --git a/01_initiation/6_pratiques_en_local.qmd b/01_initiation/6_pratiques_en_local.qmd
index b2948b6f0d9c40b546c6949197fd32995098b9ce..4bded9721cebe663664cc35fda6520129f265f53 100644
--- a/01_initiation/6_pratiques_en_local.qmd
+++ b/01_initiation/6_pratiques_en_local.qmd
@@ -1,5 +1,10 @@
 # Premières pratiques en local {.inverse}
 
+::: notes
+présentation du début de la première pratique en local
+(la pratique commence à une slide un peu plus loin)
+:::
+
 ----
 
 Généralement, les diapos seront construites avec 3 onglets permettant de faire le lien avec les outils suivants :
@@ -235,6 +240,12 @@ Ne pas essayer d'éditer les fichiers du dossier `.git`.
 3) Parcourir l'arborescence et constater qu'un dossier ".Git" a été créé
 :::
 
+::: notes
+On va versionner et initialiser git dans un dossier de projet, par exemple un dossier où vous allez mettre votre script.
+
+(pas dans le dossier home =P )
+:::
+
 ## Consultation état du dépôt
 
 ::: {.panel-tabset}
@@ -333,4 +344,4 @@ touch .gitignore
 .RData
 .Ruserdata
 ```
-:::
\ No newline at end of file
+:::
diff --git a/01_initiation/images/03_01_a_quoi_sert_git_versionnage.png b/01_initiation/images/03_01_a_quoi_sert_git_versionnage.png
new file mode 100644
index 0000000000000000000000000000000000000000..2c55a7d556cfbedddd370ef832f1926957924732
Binary files /dev/null and b/01_initiation/images/03_01_a_quoi_sert_git_versionnage.png differ
diff --git a/01_initiation/images/03_01_a_quoi_sert_git_versionnage.svg b/01_initiation/images/03_01_a_quoi_sert_git_versionnage.svg
new file mode 100644
index 0000000000000000000000000000000000000000..30d636fd1ed66e305bf4a55af90df5c509ca0e5b
--- /dev/null
+++ b/01_initiation/images/03_01_a_quoi_sert_git_versionnage.svg
@@ -0,0 +1,249 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
+
+<svg
+   width="1436.8044"
+   height="310.88547"
+   viewBox="0 0 43.104133 9.326564"
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+   sodipodi:docname="03_01_a_quoi_sert_git_versionnage.svg"
+   inkscape:version="1.3.2 (091e20ef0f, 2023-11-25)"
+   inkscape:export-filename="03_01_a_quoi_sert_git_versionnage.png"
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+   inkscape:export-ydpi="96"
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+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs1">
+    <marker
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+       orient="auto-start-reverse"
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+       markerWidth="1"
+       markerHeight="1"
+       viewBox="0 0 1 1"
+       inkscape:isstock="true"
+       inkscape:collect="always"
+       preserveAspectRatio="xMidYMid">
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+         sodipodi:nodetypes="ccc"
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+  <sodipodi:namedview
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+     pagecolor="#ffffff"
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+         y="16.96669">correction figure</tspan><tspan
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+         id="tspan41" /></text>
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diff --git a/Makefile b/Makefile
index 42a4a911cb8a915bb3c461669a53ae05baf0cf05..8deec96ce481584328a51bcb91bdfcab1bc3e49e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-SHELL := /bin/bash
+SHELL := /usr/bin/env bash
 
 BUILD_DIR := public
 SESSIONS := 01_initiation 02_gitlab_depot_distant 03_branches
@@ -7,7 +7,7 @@ INDEXES := $(SESSIONS:%=$(BUILD_DIR)/%/index.html)
 
 build: $(INDEXES)
 
-$(BUILD_DIR)/%/index.html:: %/index.qmd
+$(BUILD_DIR)/%/index.html:: %/index.qmd %/*.qmd
 	@echo -e "###\n# $@\n###"
 	quarto render $< --output-dir $(BUILD_DIR)
 
diff --git a/R_logo.png b/R_logo.png
index 932f7a90ff501cecc88915ed80eeef10491e0439..c544f7b5288fbc31d4fc425bcb9b3e494b5633cf 100644
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diff --git a/VS_code_logo.png b/VS_code_logo.png
index 9955e1851c6ea18e4cfb23880994e1a404133789..d402a8af264357b52553f50f47d0d1866861011b 100644
Binary files a/VS_code_logo.png and b/VS_code_logo.png differ
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000000000000000000000000000000000000..fe9d3f5d577b5db676eeb246147d50dfc08bfdda
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,80 @@
+{
+  description = "Description for the project";
+
+  inputs = {
+    devenv-root = {
+      url = "file+file:///dev/null";
+      flake = false;
+    };
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    devenv.url = "github:cachix/devenv";
+  };
+
+  nixConfig = {
+    extra-trusted-public-keys = "devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=";
+    extra-substituters = "https://devenv.cachix.org";
+  };
+
+  outputs = inputs @ {
+    flake-parts,
+    devenv-root,
+    ...
+  }:
+    flake-parts.lib.mkFlake {inherit inputs;} {
+      imports = [
+        inputs.devenv.flakeModule
+      ];
+      systems = ["x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
+
+      perSystem = {
+        config,
+        self',
+        inputs',
+        pkgs,
+        system,
+        ...
+      }: {
+        # Per-system attributes can be defined here. The self' and inputs'
+        # module parameters provide easy access to attributes of the same
+        # system.
+
+        # Equivalent to  inputs'.nixpkgs.legacyPackages.hello;
+        packages.default = pkgs.hello;
+
+        devenv.shells.default = {
+          devenv.root = let
+            devenvRootFileContent = builtins.readFile devenv-root.outPath;
+          in
+            pkgs.lib.mkIf (devenvRootFileContent != "") devenvRootFileContent;
+
+          name = "my-project";
+
+          imports = [
+            # This is just like the imports in devenv.nix.
+            # See https://devenv.sh/guides/using-with-flake-parts/#import-a-devenv-module
+            # ./devenv-foo.nix
+          ];
+
+          # https://devenv.sh/reference/options/
+          packages = [
+            config.packages.default
+            pkgs.quarto
+            pkgs.gnumake
+            pkgs.python3
+          ];
+
+          enterShell = ''
+            hello
+          '';
+
+          processes.hello.exec = "hello";
+        };
+      };
+      flake = {
+        # The usual flake attributes can be defined here, including system-
+        # agnostic ones like nixosModule and system-enumerating ones, although
+        # those are more easily expressed in perSystem.
+      };
+    };
+}
diff --git a/ligne_de_commande_logo.png b/ligne_de_commande_logo.png
index 48316e1686a65be8d2839927f1a837bca01c92fc..599dd30422d4a10c5c4cc61334686a80304ca2ee 100644
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