@Sudip Bhatt , Thanks for your interest in Azure DevOps. There are great resources (articles, lab exercises and practice tests) available for Azure DevOps. Azure docs are always good place to start the learning journey.
There are many different stages, concepts and components in DevOps and the following DevOps tutorial(s) are a great way to learn what DevOps is and how it can help improve your software delivery process.
Azure documentation
DevOps tutorial—an introduction
Get started with devops
Azure DevOps learning path
Deploy existing .NET apps as Windows containers (Modernizing .NET apps)
Create a CI/CD pipeline for .NET with the Azure DevOps Project
As Leon mentioned, Azure DevOps have a dedicated community for technical questions.
Happy learning!