These Warhammer 40k codices are great resources for players. When using them, you can flip through the pages to learn about the different units, strategies, and rules for the Chaos Space Marines and Aeldari. To keep them in good condition, handle them gently. Avoid bending the pages or getting them wet. Store them on a shelf in an upright position to prevent the bindings from getting damaged. If they get dirty, you can use a soft, dry cloth to wipe them clean.