how to connect cmd to directory in window 10

Microsoft Windows [Version 10.0.18362.418]
(c) 2019 Microsoft Corporation. All rights reserved.

C:\WINDOWS\system32>cd c
The system cannot find the path specified.

C:\WINDOWS\system32>cd C:\

C:\>cd D:\

C:\>cd D:
D:\

C:\>D:\
'D:\' is not recognized as an internal or external command,
operable program or batch file.

C:\>cd D:\

C:\>Cd
C:\

C:\>cd D
The system cannot find the path specified.

C:\>cd D:\

C:\>D:

D:\>Oracle

D:\>
D:\>
D:\>