Hello, the outdoor garden design can be made through terrace pillars, top walls, and free modeling. The cases are as follows:

Method 1: Free modeling to create a villa garden;

For the detailed tutorial of the villa case's garden (4.0), please click: https://www.aihouse.com/global/study/detail/457

Method 2: Pillars, terrace, and top wall production;

For the exterior scene rendering tutorial, please click the link to view the tutorial:  https://www.3vjia.com/study/video/0/10519/100003089.html