Keys Action
Ctrl Alt L Insert Title (#)
Ctrl Alt H Insert Heading (##)
Ctrl Alt Enter Insert Section Break (%%)
Ctrl I Italic
Ctrl B Bold
Ctrl U Underline
Ctrl M Monospaced
Ctrl K Hyperlink
Ctrl Alt G Latex/Equation
Ctrl Alt Enter Toggle Code/Text Mode

Title, Heading and Section Break can be triggered without the shortcut by typing #, ## and %% respectively.