Jupyter stores a list of keybord shortcuts under the menu at the top: Help > Keyboard Shortcuts, or by pressing H in command mode (more on that later). Another way to access keyboard shortcuts, and a handy way to learn them is to use the command palette: Cmd + Shift + P (or Ctrl + Shift + P on Linux and Windows).

• Turn a cell into markdown (you have to be outside of the cell) → m
• Turn a cell into code (you have to be outside of the cell) → y
• Get outside of cell → Pressing Esc to get into command mode
• Deleted a cell in Jupyter by mistake? Esc + Z
• More Shortcuts here!

Automatically Reload External Code: Using %load_ext and %autoreload 2, you can automatically use the latest version of code in all your external files without having to restart your Jupyter session.

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If you use ?? instead of ? you get additional information