Will I loose my data if I moved a partition ?

Without a backup, there's a significant risk involved—if feasible, consider creating a full backup of your D: drive data before proceeding, perhaps by copying essential files to an external drive or cloud storage. Alternatively, if you’re uncomfortable with partitioning risks, consulting a professional or using Windows' built-in Disk Management (which has limited flexibility but is safer) might be better. Given your situation, the safest route is to back up data first, then carefully resize partitions, or use a live Linux environment with more advanced tools to minimize risks.