Jupyter notebook edit and command mode

Modes: Blue - command mode, Green - edit mode
Enter - Switch to edit mode (or newline if already in edit mode)
ESC - Switch to command mode
Ctrl-Enter - execute current cell
Shift-Enter - execute current cell

Clear Cell data before saving
Button h for help
Button A - add cell Above current cell
Button B - add cell Below current cell
dd - delete current cell
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