how should I write a code in Umbraco

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ASP.NET

MVC

C#5.0

umbraco

Hello,

I'm new to Umbraco and my task is to convert a working HTML website to CMS using Umbraco.I somehow managed to design the website which allows me to modify the present data but what should I do so that it accepts dynamic data.

For Example: If I have 3 items each under a section, I should be able to add another item without modifying the code.