Customizing A running WordPress website

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Hello guys,
currently, I have a running WordPress website built with Elementor, and I would like to add a new banner to it
the banner can be hard to do with Elementor so I have to build it from scratch by coding (HTML, CSS, and js)
so my questions are
1) shall I make it like a child theme or is there any other convenient way to add my new banner?
2) can you please show me how to upload my code to the running website, there is another person who holds the administration of the WordPress admin and also the server,
3) if I made it using a child theme, how I can push my new child theme to the server (can I use a GitHub repository (if yes will the parent theme still get its updates normally))

any comment or idea will be much appreciated.

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