What do the "three happy views" and the "three taboo views" in Feng Shui mean?

The "Three Happinesses" are as follows:

1. A good start: that is, you will see red walls or decorations as soon as you open the door. When people enter the house and look around, they will immediately feel warm and uplifting.

2. You will see green when you open the door: that is, you will see green as soon as you open the door. Make life full of interest and feel comfortable.

3. When you open the door, you will see a picture: When you open the door, you will see a picture. It can not only alleviate the rush after entering the door, but also reflect the self-cultivation of the residents.

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The three taboos can be seen in this post.