Task views

Switching between task views when viewing the tasks area of a project:
Switch to board view
b
Switch to list view
l

Navigation

Move between columns and show the current one as selected
arrow keys left/right
Move between cards in a column and show the current ones as selected
arrow keys up/down
Select multiple cards in a column
[SHIFT} + arrow keys up/down

Column shortcuts

When you use the keyboard to navigate to a column you'll see it highlighted and you can use the following keyboard shortcuts:
Edit Column
e
Filter Cards
f

Card shortcuts

When you use the keyboard to navigate to a card you'll see it highlighted and you can use the following keyboard shortcuts:
Edit Task
e
Open task details in quick view panel
v
Assign task to me (in addition to current people)*
+
Unassign task from me (other people will remain)*
-
Assign task to me (unassign from anyone else)*
j
Assign task to 'Anyone' (unassign the task)*
a
Complete task*
c
Duplicate Task
d
Add a comment
n
Move card to next column
[TAB]
Move card to previous column
[SHIFT]+[TAB]

* These actions can be used with multiple cards selected