CircleCI build pipelines are configured in a .circleci/config.yml file, which differs from the configurations used in other CI/CD services like Travis CI. Developers looking to migrate their projects from Travis CI to CircleCI may find the differences in configuration daunting. This guide aims to help by comparing the core elements of Travis CI build configurations with their CircleCI equivalents, despite the inherent differences between the two systems. It provides a reference table to assist developers in understanding how to translate specific build elements from Travis CI to CircleCI, facilitating a smoother transition. Additionally, the guide encourages developers to consult CircleCI's documentation for practical migration examples and to engage with the CircleCI community for support.