Now it becomes practical. Which values should you take for a basis set size or for the k-point sampling? Are there good and bad choices? And what are the drawbacks? These documents guide you through the procedure for your preferred DFT code:
Remember you should always perform These convergence tests, whenever you start calculating a new type of crystal. This procedure guarantees you obtain numerically sound results, and not just some noise.
Let us know how it went for you: