Salesforce Visualforce
Visualforce is the component-based user interface framework for the Force.com platform. The framework includes a tag-based markup language, similar to HTML.
In this article we will create a simple Visual Force Page. Let’s get started !
- Go to Salesforce.com (SFDC) Classic

2. Go to the Quick Find / Search Tool Bar and Type in “Visualforce Pages”

3. Under Build → Develop Click Visualforce Pages

4. Click the New button

5. Create a label for your Visualforce page and an API name , the description is optional. If you don’t see the automatically generated code, you can copy and past the code below:
<apex:page>
<!-- This is a comment Begin Default Content REMOVE THIS -->
<h1>Congratulations</h1>
This is your new Page
<!-- End Default Content REMOVE THIS -->
</apex:page>

6. Click Preview and you are done ! Congratulations you have created your first simple Visualforce page.

Here is some extra code to change up your Visualforce page:
<apex:page>
<!-- Saying Hello -->
<h1> Hello "{!User.LastName}" , welcome to Salesforce </h1>
<p> Today's Date is {!TODAY()}</p>
<p> The year today is {!YEAR(TODAY())}</p>
<p> Tomorrow will be day number {!DAY(TODAY() + 1)}</p>
<p> Let's find a max number : {!MAX(1,2,3,4,5)}</p>
<p> Is it true salesforce.com contains force.com? {!CONTAINS('salesforce.com', 'force.com')}</p>
</apex:page>
If you are interested in learning more about Salesforce check out Salesforce.com for Dummies, it has a lot of good information about the platform.

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RESOURCE:
https://developer.salesforce.com/page/An_Introduction_to_Visualforce