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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. 

Technically, you can start tiling in a corner and work your way out. However, it's not traditionally how tiling is done. Instead, work from the bottom middle of the wall. Tile out the entire row with whole tiles before moving on to the next row. Once you finish installing all of the whole tiles, then you focus on tiling the corners.

You can technically install tile over tile, but we don’t suggest it. Installing tile over any surface that isn’t a completely flat and prepared subfloor will result in a shoddy overall job, uneven flooring, tiles that don’t adhere, extra weight, gaps, cracks, and room for moisture and dirt to enter. For the best results, only install new tile on a flat, sanded surface like subflooring or concrete that is prepared for tile.

If you have asbestos tile and would rather tile over it than remove it, or if your existing tile is completely flat and bonded tightly to the floor, you may be able to tile over existing tile. But experts recommend thinking twice before you do.

Glass tile is one of the easiest materials to maintain. It is both stain and water-resistant, making it easy to clean and incredibly durable. This also makes it resistant to mold and mildew. However, make sure it’s kept clean, otherwise, your grout might start to degrade. Glass is liable to scratch, so ensure you’re using non-abrasive materials and products, like soft sponges and wipes.