Jan van den Hemel writes: Are triangles always bad? No, but for deforming objects like characters you definitely want to use quads, otherwise the deformations don’t look optimal. There’s a quick trick that lets you convert a tris-only object to a quad-only object. Check it out!
from BlenderNation https://www.blendernation.com/2020/01/29/daily-blender-tip-tris-to-quads/