How to remove Triangles and Ngons I'm new to Blender and 3D modelling in general. I encountered a problem where I can't remove Tris/Ngons after using the boolean modifier (Union) to combine 2 objects to make the handle of a sword.

this is the mesh



Is there a way so that all of them would become Quads?
Thanks for your help in advance.
Using quads not always necessary. But, anyway, here how would i do this task: