WordPress

Visual Post Editor

Insert link

Alt + ↑   Shift + A

All hotkeys for WordPress

Visual Post Editor
Bold

Ctrl + B

Visual Post Editor
Italic

Ctrl + I

Visual Post Editor
Underline

Ctrl + U

Visual Post Editor
Insert/edit link

Ctrl + K

Plain text editor
Copy

Ctrl + C

Plain text editor
Paste

Ctrl + V

Plain text editor
Cut

Ctrl + X

Visual Post Editor
Select all

Ctrl + A

Plain text editor
Undo

Ctrl + Z

Plain text editor
Redo

Ctrl + Y

Visual Post Editor
Insert heading with specified number. Ctrl+1 adds h1, Ctrl+2 adds h2

Ctrl + 1

Visual Post Editor
Check spelling

Alt + ↑   Shift + N

Visual Post Editor
Align left

Alt + ↑   Shift + L

Visual Post Editor
Align center

Alt + ↑   Shift + C

Visual Post Editor
Align right

Alt + ↑   Shift + R

Visual Post Editor
Strikethrough

Alt + ↑   Shift + D

Visual Post Editor
Unordered list

Alt + ↑   Shift + U

Visual Post Editor
Insert link

Alt + ↑   Shift + A

Visual Post Editor
Remove link

Alt + ↑   Shift + S

Visual Post Editor
Quote

Alt + ↑   Shift + Q

Visual Post Editor
Insert image

Alt + ↑   Shift + M

Visual Post Editor
Full screen, distraction free writing mode

Alt + ↑   Shift + W

Plain text editor
Publish

Alt + ↑   Shift + P

Visual Post Editor
Rich text editor help

Alt + ↑   Shift + H

Plain text editor
Print

Ctrl + P

Plain text editor
Full screen mode

Alt + ↑   Shift + F

Comments screen
Next comment (moves the current selection down)

J

Comments screen
Previous comment (moves the current selection up)

K

Comments screen
Approve comment

A

Comments screen
Unapprove comment

U

Comments screen
Delete comment

D

Comments screen
Reply comment

R

Comments screen
Quick edit a comment

Q

Comments screen
Restore Comment from Trash or Undo if you Delete a comment

Z

Comments screen
Approve checked comments

↑   Shift + A

Comments screen
Delete checked comments

↑   Shift + D

Comments screen
Unapprove selected comments

↑   Shift + U

Comments screen
Move selected comments to trash

↑   Shift + T

Comments screen
Restore selected comments from trash

↑   Shift + Z

Similar combinations for other applications

Gmsh 4.1.4
Hide/show small axes
General

Alt + ↑   Shift + A

Google Chrome
Allow within a notification
Webpage shortcuts

Alt + ↑   Shift + A

Nuclide (Linux)
Nuclide can fix certain types of problems for you automatically, including various lint problems. This will allow all those to be fixed in the current file.
Code diagnostics

Alt + ↑   Shift + A

draw.io
Connection arrows
Document

Alt + ↑   Shift + A

Microsoft Word 2016
Expand or collapse all text or headings
Working with headings in Outline view

Alt + ↑   Shift + A

Google Sheets
(in other browsers. Present when screen reader support is enabled)  Accessibility menu
Open a menu

Alt + ↑   Shift + A

Blender
Play animation in reverse toggle
General

Alt + ↑   Shift + A