Splitting your drive into multiple partitions has its uses, but it's a good idea to take some extra care before doing it.

If you want to change or increase the Windows Recovery Environment or WinRE partition size in Windows 11/10, see this post for the instructions.

Use a Windows tool to make your backups easier, set up an emergency recovery partition or install another OS. By Patrick Miller, PC World – Disk partitioning–separating one physical hard drive ...

Unallocated Disk Space can be assigned its own volume letter or used to extend another drive. Types of Partitions are also explained.