Keep it simple. Use these five rules every time.
Start with a clean base. That means a neat table, no random clutter. Use a tablecloth, runner, or just bare wood. Pick one and stick to it.
One clear centerpiece. One thing in the middle is better than many small things. A vase with flowers, one candle group, or a bowl of fruit works.
Layer textures. Mix wood, glass, textile. For example: wooden table + linen napkins + ceramic plates. Texture = visual comfort.
Match scale. Big tables need bigger centerpieces. Small tables need low, simple centerpieces so people can see each other.
Keep pathways clear. Guests need space to put down plates and reach food. If the table is crowded, the meal feels cramped.
Simple example: bare oak table + linen runner + one low vase with greenery + white plates + warm candles. Done