Develop an instrumentation strategy (10-15%): This domain focuses on setting up logging, monitoring, and alerting for Azure applications. 

Develop a Site Reliability Engineering (SRE) strategy (10-15%): In this section, you'll learn about implementing reliability practices and managing incidents. 

Manage source control (20-25%): This involves understanding version control systems, branching strategies, and repository management.  

Implement continuous integration (20-25%): Here, you'll cover CI pipelines, build automation, and integrating third-party tools. 

Implement continuous delivery (20-25%): This focuses on deploying applications, infrastructure as code, and release management. 

Official Microsoft Documentation: Start with the official Microsoft documentation for Azure DevOps. It provides detailed insights into the features, functionalities, and best practices of Azure services. 

Online Courses: Enroll in an AZ-400 course from reputable platforms like Microsoft Learn, Udemy, or Coursera. These courses offer structured learning paths, hands-on labs, and often include practice exams to test your knowledge. 

Books and Study Guides: Consider investing in study guides specifically tailored for the AZ-400 exam. Books like "Exam Ref AZ-400 Designing and Implementing Microsoft DevOps Solutions" provide in-depth coverage of all exam objectives. 

Practice Tests: Utilize practice tests to gauge your understanding and readiness for the actual exam. Websites like MeasureUp or Whizlabs offer high-quality practice questions and simulated exam environments. 

Set Clear Goals: Define specific goals for each week. For instance, aim to cover one exam domain per week, ensuring you spend adequate time on hands-on labs. 

Allocate Time Wisely: Dedicate consistent study hours each day. A regular schedule helps reinforce learning and keeps you engaged. 

Utilize Learning Techniques: Use varied learning methods such as reading, watching video tutorials, and engaging in hands-on labs. This variety can improve retention and understanding. 

Join Study Groups: Consider joining study groups or forums where you can collaborate with others preparing for the AZ-400 exam. Platforms like Reddit, Microsoft Tech Community, or LinkedIn groups can be beneficial for discussions and insights. 

Create a Free Azure Account: Microsoft offers free Azure accounts with credits for new users. Use this opportunity to practice deploying applications, setting up CI/CD pipelines, and managing source control in Azure DevOps. 

Simulate Real-World Scenarios: Work on personal or open-source projects where you can apply DevOps practices. This hands-on experience will enhance your skills and prepare you for scenario-based questions in the exam. 

Review Case Studies: Analyze case studies of organizations implementing DevOps practices. Understanding real-world applications of Azure services will provide context and depth to your knowledge. 

Practice Exams: Take multiple practice exams to familiarize yourself with the question formats and time constraints. This will also help identify areas needing more focus. 

Flashcards: Create flashcards for key concepts, terms, and definitions. Reviewing these regularly can reinforce your memory. 

Teach Others: Teaching concepts to peers or studying partners can deepen your understanding and uncover knowledge gaps.