Pull requests and code reviews are essential workflows for high-performing engineering teams, aiding in efficient collaboration and quality assurance. The process begins with draft pull requests, allowing engineers to indicate ongoing work and prepare content for peer review, which can later be converted to ready-for-review status. Reviewers can suggest changes through specific comments and request modifications, while conflicts can be resolved either via the IDE or GitHub UI. Approval from reviewers signals readiness for merging, with options such as creating a merge commit, squashing, or rebasing. Stacked pull requests can help manage large tasks or enable multiple engineers to work on the same feature. Best practices include clearly stating the purpose of requests, using formal language, involving relevant team members, and employing positive communication during reviews to foster team growth and improve product quality. Additionally, GitHub's pull request checks, CLI tools, and integration with third-party applications enhance workflow efficiency and notification management.