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List of commands mentioned in the video:

&&: run two commands in one line. e.g. CLS && VER

START www.google.com: open programs and websites.
COPY -z to display copy progress in per cent.
CIPHER /w:d to wipe 0x00/0xFF/random unused hard-disk space.
DEL /q /f /s %temp%\* to empty temporary folder.
ASSOC .extension = filetype to modify extension associations.
%systemroot%\system32\scrnsave.scr /s blank the screen immediately.
NETSTAT | CLIP redirect command output to clipboard.
SHUTDOWN -r -t 360: shutdown in 60 seconds, -a to abort
OSK: bring up the on-screen keyboard.

0:00 Command Prompt Secrets
0:40 Double-ampersand Operator
1:15 Windows Explorer Trick
1:48 Start Operator Trick
2:15 Copy Operator Progress
2:48 Cipher: Wipe Unused Space on Drive
3:20 Del to delete Windows Temp files
3:56 View and change extension associations
5:41 Force screen to go black
6:24 Send command output to clipboard
6:55 Shutdown your computer

Image by wayhomestudio on Freepik