Formatting
BoldCtrl+B
ItalicCtrl+I
StrikethroughCtrl+Shift+X
Inline codeCtrl+`
LinkCtrl+K
Headings
Heading 1Ctrl+1
Heading 2Ctrl+2
Heading 3Ctrl+3
Blocks
Bullet listCtrl+Shift+U
Ordered listCtrl+Shift+O
BlockquoteCtrl+Shift+Q
Code blockCtrl+Shift+C
TableCtrl+Shift+T
ImageCtrl+Shift+I
Horizontal ruleCtrl+Shift+H
View & App
Split viewCtrl+\
Editor onlyCtrl+Shift+E
Preview onlyCtrl+Shift+P
UndoCtrl+Z
RedoCtrl+Shift+Z
Save / DownloadCtrl+S
This cheatsheetCtrl+/