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You can lay tile directly on a plywood countertop, but if it’s a high-traffic surface in a kitchen, it’s better to add a moisture-resistant base. Plywood is susceptible to moisture, so if dampness seeps through from the surface around the sink or where you prep food, it can cause the plywood to warp, leading to grout damage, cracked tiles, or mold growth under the surface. 

Uniform spacing between tiles is important for a professional and clean appearance. To achieve this spacing, tile spacers should be placed between the tiles and left in place until the mortar hardens and the tiles are secure. You can use X-shaped spacers vertically in between the tiles and laid flat at the corners.

You can, in theory, tile your fireplace hearth with most tiles. However just because you can, doesn’t mean you should. For example, it’s much better to use unglazed tiles because glazed tiles are more resistant to cracking under extreme heat. Porcelain is more heat-resistant than ceramic, but you can still design the hearth as you like by putting the most heat-resistant tiles directly under the fire and, if it matches your style, add more decorative tiles further from the center of the fire. 

Yes, you can tile over existing shower tiles, but it's better to remove the old tiles first for the best results. Tiling over existing tiles requires a clean, level surface and proper adhesion. If the old tiles are in good condition, you can roughen the surface to improve adhesion. However, removing the old tiles ensures a smoother, longer-lasting finish and prevents potential issues down the line.