Explore MFEM, a modular parallel C++ library for finite element methods, in this comprehensive tutorial from LLNL's High Performance Computing Innovation Center. Dive into the project's goal of enabling high-performance scalable finite element discretization research and application development across various platforms, from laptops to supercomputers. Discover how MFEM functions as a finite element toolbox, providing building blocks for developing finite element algorithms similar to MATLAB for linear algebra methods. Learn to leverage MFEM's capabilities for your own research and applications through hands-on demonstrations and explanations. Access additional resources, including documentation and tutorials, to further enhance your understanding of this powerful open-source software tool for high-performance computing and mathematical modeling.