To plan and execute Sprints and Releases, an Agile development team needs to follow some best practices, such as defining the product vision and roadmap, prioritizing the product backlog, estimating user stories or tasks, planning the Sprint, executing the Sprint, reviewing the Sprint, planning the Release, and executing the Release. These processes involve describing overall goals and high-level features of the product, ranking user stories according to their value, urgency, and dependency, measuring how much effort and time they will take to complete, selecting user stories from the product backlog that can be finished within a certain time frame, defining acceptance criteria and definition of done for each of them, working on user stories using Agile methods and tools, presenting product increment to stakeholders and collecting feedback, evaluating team's performance and Sprint outcome, deciding which features and fixes are included in the Release and when they are ready to be deployed based on product vision and feedback, testing verifying and documenting product version before deploying it to customers or users using DevOps methods.