diff --git a/journal/journal-de-bord.md b/journal/journal-de-bord.md
index c9da64316d8d69f9341e9b8d57c95fe5eb78f49a..94e887e52c11dfea2769d4bea62bfe8d42cbc0d1 100644
--- a/journal/journal-de-bord.md
+++ b/journal/journal-de-bord.md
@@ -8,3 +8,26 @@
   - add notes in metadata `exiftool -notes="some note" filename`
   - see a specific data `exiftool -comment filename`
 - [docfetcher](https://sourceforge.net/projects/docfetcher/)
+
+# 2020-07-23
+
+## tools
+
+- the computational document is composed of text in different blocks of code in which the results of the previous blocks can be used
+
+- Jupyter
+  - Shit enter to run the current block and run another
+  - Y : change cell to code
+  - M : change cell to markdown
+  - [Tips & tricks](https://www.dataquest.io/blog/jupyter-notebook-tips-tricks-shortcuts/)
+  - for lecture or tutorial
+	- easy to use
+	- dynamic
+- Rstudio/knitR
+  - can also execute python code but without the variables being available from one block to another
+- orgmode
+  - M-x org-babel-execute-bufer to reset the session
+  - orgmode can also allow to execute remote command using just an ssh command and then continue (even in other blocks)
+  - for a journal -such as mine-
+  - for a lab journal
+  - for reproducible article