When do I need to Spackle My Walls?

If your house was built in 1950s or later, then most likely you have drywall walls.
You may need minor spackling done if your drywall walls have minor holes / cracks / scratches that need to be spackled before painting.
You may need major spackling done if your drywall walls have major scratches, holes and/or cracks that need to be spackled before painting.