diff --git a/guide/english/bootstrap/jumbotron/index.md b/guide/english/bootstrap/jumbotron/index.md
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+---
+title: Jumbotron
+---
+
+## Jumbotron
+
+`Jumbotron` is Lightweight, flexible component for showcasing hero unit style content.
+`Jumbotron` is a responsive component which the main goal is to focus visitor's attention or highlight the special piece of information.
+
+Jumbotron make use of almost any other bootstrap code to additionally increase its engagement value. It's operate with images,enlarged fonts,different backgorund styles etc.
+
+### Most Attracting features of jumbotron
+
+ - * Showcase the marketing messages on your site
+ - * Project presentation
+ - * Article introduction
+ - * Image showcase
+
+### How to use
+
+Use a `<div>` element with class `.jumbotron` to create a jumbotron:
+
+
+
+**Code Example:**
+```
+
+
Hello, world!
+
This is a simple hero unit, a simple jumbotron-style component for calling extra attention to featured content or information.
+
+
It uses utility classes for typography and spacing to space content out within the larger container.
+
Learn more
+
+
+```
+#### Fluid jumbotron
+
+To make the jumbotron full width, and without rounded corners, add the `.jumbotron-fluid` modifier class and add a `.container` or `.container-fluid` within.
+
+**Code Example:**
+
+```
+
+
+
Fluid jumbotron
+
This is a modified jumbotron that occupies the entire horizontal space of its parent.
+
+
+```
+
+### More Information:
+
+- [Bootstrap Jumbotron components Doc](https://getbootstrap.com/docs/4.0/components/jumbotron/)
diff --git a/guide/english/html/editors/index.md b/guide/english/html/editors/index.md
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+---
+title: HTML Editors
+---
+
+### HTML editors
+
+An `HTML editor` is a program for editing `HTML` markup language. HTML editors can be created and modified HTML document.
+
+However, for leraning HTML we recomended simple text editor like Notepad (Windows PC) or TextEdit (Mac).
+
+* Simple text editor is good way to learn HTML for beginners.
+* There are two main varieties of HTML editors: textual and WYSIWYG (what you see is what you get) editors.
+
+### Text editor
+
+Basic text editor is source code editors, include additional tools specifically geared toward handling code.
+
+
+### WYSIWYG editors
+
+HTML editors that support What You See Is What You Get (WYSIWYG) paradigm provide a user interface similar to a word processor for creating HTML documents, alternative to manual coding for editing HTML documents.
+
+
+### Write HTML using Notepad or TextEdit
+
+follow the below four steps to create your first web page with Notepad or TextEdit.
+* * *
+
+#### Step 1: Open Notepad (Windows PC)
+
+**Windows 8 or later:**
+
+1. Open the **Start Screen** (the window symbol at the bottom left on your screen).
+ Type **Notepad**.
+
+**Windows 7 or earlier:**
+
+1. Open **Start > Programs > Accessories > Notepad**
+
+#### Step 1: Open TextEdit (Mac)
+
+1. Open **Finder > Applications > TextEdit**
+
+2. Also change some preferences to get the application to save files correctly.
+ In **Preferences > Format >** choose **"Plain Text"**
+
+3. Then under "Open and Save", check the box that says "Display HTML files as HTML code instead of formatted text".
+
+4. Then open a new document to place the code.
+
+#### Step 2: Write Some HTML
+
+Write or copy some HTML into Notepad.
+
+```HTML
+
+
+
+
+My First Heading
+
+My first paragraph.
+
+
+
+```
+
+#### Step 3: Save the HTML Page
+
+1. Save the file on your computer. Select **File > Save** as in the Notepad menu.
+
+2. Name the file **"index.html"** and set the encoding to **UTF-8**
+ (which is the preferred encoding for HTML files).
+
+> You can use either .htm or .html as file extension. There is no difference, it is up
+> to you.
+
+#### Step 4: View the HTML Page in Your Browser
+
+Open the saved HTML file in your favorite browser (double click on the file, or right-click - and choose "Open with").
+
+### List of Editors (Open-source and Commercial softwares)
+
+* [Eclipse](https://www.eclipse.org)
+* [Atom](https://atom.io)
+* [WebStorm](https://www.jetbrains.com)
+* [Microsoft Visual Studio](https://visualstudio.microsoft.com/)
+* [NetBeans](http://netbeans.apache.org/)
+* [Brackets](http://brackets.io)
+* [EditPlus](https://editplus.com/)
+* [Sublimetext](https://www.sublimetext.com)
+
+#### More Information:
+
+Wikipedia HTML editors tag
+W3schools HTML Editors tag
+
diff --git a/guide/english/html/responsive-web-design/index.md b/guide/english/html/responsive-web-design/index.md
index 2532c3b13ca..5cc3b8413b3 100644
--- a/guide/english/html/responsive-web-design/index.md
+++ b/guide/english/html/responsive-web-design/index.md
@@ -49,6 +49,76 @@ The Bootstrap framework divides a row into twelve columns. In the above example,
![Grid Example](https://www.javatpoint.com/bootstrappages/images/bootstrapgrid.jpg "Basic Grid Example")
+### 3. Flexbox Model
+
+The `flexbox layout model`, makes it's easier to design responsive layout structure without using float or positioning.
+
+This layout model is one-dimensional layout model, and as a method that could offer space distribution between items in an interface and powerful alignment capabilities.
+
+The main axis is defined by `flex-direction`, which has four possible values:
+
+ * row
+ * row-reverse
+ * column
+ * column-reverse
+
+To start using the Flexbox model, you need to first define a `flex container`.
+The flex container becomes flexible by setting the display property to flex:
+
+```
+
+
+```
+#### The flex container properties are:
+
+ * flex-direction
+ * flex-wrap
+ * flex-flow
+ * justify-content
+ * align-items
+ * align-content
+
+#### The flex item properties are:
+
+ * order
+ * flex-grow
+ * flex-shrink
+ * flex-basis
+ * flex
+ * align-self
+
+#### CSS Flexbox Properties
+
+The following table lists the CSS properties used with flexbox:
+
+| Property | Description |
+| ------------- | -------------------------------------------------------------------------------- |
+| display | Specifies the type of box used for an HTML element |
+| flex-direction | Specifies the direction of the flexible items inside a flex container |
+| justify-content | Horizontally aligns the flex items when the items do not use all available | | | space on the main-axis |
+| flex-wrap | Specifies whether the flex items should wrap or not,there is not enough |
+| | if room for them on one flex line |
+| align-content | Modifies the behavior of the flex-wrap property. It is similar to align-items,but| | | instead of aligning flex items, it aligns flex lines |
+| flex-flow | A shorthand property for flex-direction and flex-wrap |
+| order | Specifies the order of a flexible item relative to the rest of the flex items | | | inside the same container |
+| align-self | Used on flex items. Overrides the container's align-items property |
+| flex | A shorthand property for the flex-grow, flex-shrink, and the flex-basis |
+| | properties |
+| align-items | Vertically aligns the flex items when the items do not use all available |
+| | space on the cross-axis |
+
+#### Shorthand values for the flex properties
+The predefined values are as follows:
+
+ - flex: initial
+ - flex: auto
+ - flex: none
+ - flex:
+
### More Information:
1. CSS Flexbox Complete tutorial in 8 minutes