I generally recommend to exit either via :xa (save all & exit) or :qa! (discard all and exit), bound to ZZ or ZA respectively. If you exit via :q or :wq, it just closes the current buffer, and moves to the next one. E.g. if you have a neotree open along with the editor, you type :wq, it closes the editor buffer and moves you into the file tree, which can be very confusing for beginners.
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