/3/ - 3DCG

how do I wrap my head around subdivision surface topology? I want to maintain my sharp corners but it feels like everything I do just ends up fucking the shading while still not even preserving the corners I want

Pic related, I've tried bevelling shit, it doesn't do anything. Creasing had the same result. I want to be able to subdiv so I can bake out maps etc. while maintaining the corners (more or less) of the original mesh. This is just one example, but it's a problem I haven't been able to solve countless times leading to me giving up...