pavla writes: Booleans are essential to hard surface modeling. But they can produce some ugly results if they’re not used carefully. In this video, Thibaut Bourbon deciphers the anatomy of clean booleans and the techniques for achieving them, all with Blender’s included tools. If hard surface modeling is your thing, don’t miss this important insight.
from BlenderNation https://www.blendernation.com/2018/11/17/how-to-create-clean-booleans-with-blender/