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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. 

You should always use caulk instead of grout where the tile meets the wall. This will help your tile installation look great and last a long time. When you accidentally use grout for the corner seams, you end up making the tiles too rigid. So as the wall shifts over time, your tiles have no wiggle room. This can lead to tile damage, which will eventually require you to do at least a partial reinstallation.

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.

Yes, but you should only put tile directly on drywall in smaller areas that don’t experience excess moisture. For example, a small kitchen tile backsplash could work, but installing tile directly on the drywall in a bathroom or other chronically damp area is not a good idea. Either way, a cement backer board is a far more reliable solution, as drywall is susceptible to moisture and can warp or cause your tiles to crack.