To move beyond basic syntax, an advanced curriculum (like the one found in Perry's book) typically focuses on four "pillars":
Theory is best reinforced through project-based learning. High-level repositories like nCally/Project-Based-Tutorials-in-C recommend building: : Learn process management and system calls. A Sudoku Solver : Master backtracking algorithms. An OS Kernel : The ultimate test of low-level C knowledge. advanced c programming by example pdf github
GitHub hosts several massive collections of C programming books and code examples that serve as a "digital library" for advanced learners. To move beyond basic syntax, an advanced curriculum