Quick shortcuts for future reference :)

shortcuts.txt

# Quitting VIM fastly
ESC + ZZ (equal to wq! if file name is already set)

# Quitting VIM fastly no saving
ESC + ZQ

#  Split pane
Command + d (iTerm2 split pane vertically)

Command + D (iTerm2 split pane horizontally)

# Moving between panes

Command + [ or Command + ]

# Copying between panes

Enter vi copy mode: SHIFT + Command + c
Move the marker and press SPACE for selection
Command + C for copying

And pasting as usual with Command + v (on any other pane)