Many new laptops ship with one visible C drive. That is normal. You can create a D drive by shrinking C drive, but leave enough space for Windows and updates.

A separate data partition can make files easier to organize, but it is not a backup. If the disk fails, all partitions on that disk are still at risk.
If your new laptop has only C drive, you can shrink C drive and create a new D drive from the unallocated space. This changes the disk layout, so back up important files first.
Check the total disk size and used space on C drive. Leave enough room for Windows, installed apps, updates, and temporary files. For most new laptops, do not shrink C drive below what you actually need for daily use.
Open Qiling Disk Master and select C drive on the internal system disk. Confirm it is the correct partition by drive letter, capacity, and position near the EFI and Recovery partitions.

Choose Resize/Move and drag the right edge of C drive leftward to create unallocated space. The unallocated space will be used for the new D drive.

Confirm that C drive will be smaller and that no EFI, Recovery, or hidden partition is being removed. Click Proceed and wait for the resize operation to finish.
Select the unallocated space, choose Create, assign drive letter D if available, set the file system to NTFS, and click Proceed. After it finishes, open File Explorer and move personal folders only if you want them stored on D drive.

Having only C drive on a new laptop is normal. Split it only when a separate data partition helps your file organization, and remember that another partition is not a backup.