Although many users upgrade their system to Windows 10, Voluntary or by force, Window 7 still have a large market, so problems are most related to Windows 7. Like how-tos in Windows 7 and Free Partition Magic for Windows 7, here's the list.
Here are the list of Guide Page of how to resize partition in Windows 10 and things that related to the newest Windows System, you can find detailed steps with Screenshots to fix low disk space issue and extend partition without data loss.