The document provides a comprehensive guide on creating C++ applications using GitLab CI, covering essential tools and configurations like GitLab Runner, Cppcheck, Clang-Tidy, and Doxygen. It outlines the required directory structure, build processes, testing methods, and deployment steps involving CMake, Conan, and CPack. The guide emphasizes the importance of using open-source tools within the GitLab environment to standardize development workflows.