What are the best practices for installing tile on walls?

When installing tile on walls, it is important to properly prepare the surface by ensuring it is clean, dry, and smooth. Use the right adhesive for the type of tile being installed and follow the manufacturer's instructions. Start tiling from the center and work your way outwards, using spacers to maintain even spacing. Grout the tiles once they are set and seal the grout to protect it from moisture and stains.