Contributed to the mphowardlab/essential-math repository by developing a feature expansion focused on second-order ordinary differential equations. Built an Undetermined Coefficients Skill Builder, adding two new problems with comprehensive, step-by-step solutions to enhance learners’ understanding of ODE techniques and structured problem-solving. The work emphasized clear technical writing and mathematical rigor, using Markdown to deliver accessible educational content. Collaboration was supported by updating project documentation to recognize additional contributors. No bug fixes were addressed during this period, as the primary effort centered on expanding the repository’s instructional resources and improving the workflow for both learners and fellow contributors.