How should I properly grout or caulk the corners of my shower to ensure a water-tight seal and prevent any potential leaks?

To properly grout or caulk the corners of your shower for a water-tight seal, first clean the area thoroughly. Apply grout to the corners using a grout float, ensuring it fills the gaps completely. Smooth the grout with a damp sponge. For caulking, use a silicone-based caulk and apply it in a continuous bead along the corner. Smooth the caulk with a wet finger. Allow it to dry completely before using the shower to prevent leaks.