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Tile shouldn’t be set tight against the tub. Bathtubs can expand when filled, and they can shift slightly with the weight of occupants. For this reason, it’s important to leave a slight gap between the bathtub and the first row of tile. Aim for a narrow gap of approximately 1/16 of an inch, filled with caulk, to allow for this expansion and movement while still allowing for tile shower waterproofing.

Your floors should be completely level for tile, otherwise you risk damaging the tiles in the future. When there are even small gaps or hills in the subfloor beneath the tile, this puts more pressure on the tile when you walk around on the floor. With repeated traffic, the tiles are at risk of cracking, and you’ll have to deal with tile repairs sooner than if the floor was completely level.

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. 

Like glass tiles, you will not need to seal most porcelain tiles, particularly if the porcelain is already glazed. It depends on quality. Porcelain is very water resistant, but it is not 100% waterproof. To avoid staining, some homeowners use a penetrating sealer. It is also a good idea to seal your grout. Unless you use epoxy grout, grout is very porous and can harbor bacteria, mold, and mildew.