Hi Yrishi.
I would recommend you start with understanding the Repository and Unit of work design patterns as well as Dependency Injection.
You can use Entity Frameworks. Focus on the code first way of setting it up.
Here are the links that you can use to get you started and going pretty quick. I used them and they helped me a lot.
Entity Framework Code-First[
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CRUD Operations Using Entity Framework 5.0 Code First Approach in MVC[
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I hope this helps. You are welcome to ask more questions.
Regards