there's also zR - Open all folds zM - Close all folds zO - Open all folds under the cursor recursively zC - Close all folds under the cursor recursively

there's also zR - Open all folds zM - Close all folds zO - Open all folds under the cursor recursively zC - Close all folds under the cursor recursively zX - Undo manually opened and closed folds: re-apply 'foldlevel'.