command mode

I‘m new to Linux or UNIX like operating system. I just wanted to create a file called demo.txt and save & close it using vi text editor. How do I save a file using vi?

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I’m just starting in vim text editor but I’m annoying typing and retyping similar statements. Can you address me about it?

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Can you tell me few useful vim text editor keyboard short cuts for moving around while editing text files?

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