Improve front-end training

training/front-end/01-modern-javascript.md

@@ -747,6 +747,7 @@ Other assessments:
 - [ES2015 / ES6: Basics of modern Javascript](https://www.slideshare.net/WojciechDzikowski/es2015-es6-basics-of-modern-javascript)
 - [JavaScript](https://en.wikipedia.org/wiki/JavaScript), Wikipedia
 - [mbeaudru/modern-js-cheatsheet](https://github.com/mbeaudru/modern-js-cheatsheet)
+- [The vanilla Javascript basics to know before learning React JS - DEV](https://dev.to/tracycss/the-vanilla-javascript-basics-to-know-before-learning-react-js-53aj)
 
 Future changes:
 

training/front-end/02-react.md

@@ -3,17 +3,27 @@
 ## Table of Contents
 
 - [An introduction to React](#an-introduction-to-react)
+  - [Recap of the previous session](#recap-of-the-previous-session)
   - [Before getting into React...](#before-getting-into-react)
     - [Manipulating the DOM](#manipulating-the-dom)
-    - [The inspiration for React](#the-inspiration-for-react)
-    - [The shadow DOM](#the-shadow-dom)
   - [Learning React](#learning-react)
+  - [Exercise](#exercise)
   - [Self-assessment](#self-assessment)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
 
 # An introduction to React
 
+## Recap of the previous session
+
+See previous session
+
+- Arrow functions
+- Classes
+- `let` and `const`
+- Object and array destructuring
+- Template literals
+
 ## Before getting into React...
 
 ### Manipulating the DOM
@@ -21,14 +31,16 @@
 - https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Client-side_web_APIs/Manipulating_documents
 - https://developer.mozilla.org/en-US/docs/Web/API/Document_Object_Model/Introduction
 
-### The inspiration for React
-
-### The shadow DOM
-
 ## Learning React
 
 Follow the tutorial: https://reactjs.org/docs/hello-world.html
 
+We have chosen this tutorial over the "learn by doing" one because it introduces the concepts behind React. It is very well done and very complete.
+
+## Exercise
+
+Use one of our hiring exercises.
+
 ## Self-assessment
 
 Basics:

training/front-end/03-typescript.md

@@ -5,6 +5,7 @@
 - [TypeScript](#typescript)
   - [Differences between TypeScript and JavaScript](#differences-between-typescript-and-javascript)
   - [An introduction to TypeScript's type system](#an-introduction-to-typescripts-type-system)
+  - [Exercises](#exercises)
   - [References](#references)
 
 <!-- END doctoc generated TOC please keep comment here to allow auto update -->
@@ -15,6 +16,10 @@
 
 ## An introduction to TypeScript's type system
 
+## Exercises
+
+- [TypeScript Exercises](https://typescript-exercises.github.io/)
+
 ## References
 
 - [ES5 to ESNext — here’s every feature added to JavaScript since 2015](https://www.freecodecamp.org/news/es5-to-esnext-heres-every-feature-added-to-javascript-since-2015-d0c255e13c6e/)