Don’t know either, but I found it to be a good exercise to split, rework and rejoining or even deleting problematic zones in edit mode and trying to recreate them one part at a time by by reconnecting and adding vertices etc. It builds confidence and insight in how things work somehow.
But indeed, you want a workflow that allows you to detect issues as soon as possible In the process. Wonder what tips the CG cookie crew has to give here.
