Core aggregate functions like SUM, COUNT, MAX, MIN
Ranking functions like ROWNUM, RANK, NTILE
String functions like SUBSTR, REPLACE,INSTR
Data conversion functions like CAST, CONVERT

Slack space is unused space in a cluster. 
If a file requires less space than a cluster, the center cluster will be reversed but data will be stored in it. 

Any extra space(Sector) not used to write data is a slack space, and it might contain data of the previously stored file.

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Block or Cluster will be either used or unused in a file system. When I say it’s unused, so it doesn’t mean that the block or cluster is ‘Blank’. It might be possible that it has some deleted data.

For example- If a word file was stored is multiple blocks, and you deleted it. Some blocks are used by the file system to store another file.

Question: Is it possible to recover the whole work file?
No, but you can recover some fragments (Unused blocks) of the file (might be half of the file or One page) 

General

Control + A                                  Select All Text or Items

Control + C                                  Copy

Control + V                                  Paste

Control + Z                                  Undo

Control + Shift +F                       Advanced Find

Tab                                                Move Cursor to Next Field

Shift + Tab                                   Move Cursor to Previous Field

Alt-Tab                                         Switch between Open Windows

Outlook Navigation

Control + 1                                  Go to Email

Control + 2                                  Go to Calendar

Control + 3                                  Go to Contacts

Control + 4                                  Go to Tasks

Control + 5                                  Go to Notes

Inbox Organization

Delete                                          Delete Selected Item

Control + Shift + V                      Move Selected Item to a Folder

Control + Y                                  View a Folder

Insert                                            Flag for Follow-Up

Control + E                                  Quick Search

Contacts

Control + Shift + C                      Create a New Contact

F11                                               Contact Quick Search

Control + Shift + B                      Display the Address Book

Alt + S                                           Save and Close

Email Writing

Control + Shift + M                    Create a New Email Message

Control + R                                  Reply

Control + Shift + R                      Reply to All

Control + F                                  Forward

Control + K                                  Insert Hyperlink

Control + S                                  Save as Draft

Alt + S                                           Send

Calendar

Control + G                                  Jump to a Date

Alt + Up/Down Arrows              Jump up and Down a week

Alt + Minus                                  Week View

Alt + Equals                                 Month View

Alt + Number (1-9, 0)                View # of Days

Control + E                                  Quick Search

Appointments

Control + Shift + A                     Create a New Appointment

Alt + S                                           Save and Close

Tasks

Control + Shift + K                      Create a New Task

Alt + S                                           Save and Close