This is really a basic WP/HTML/CSS/Design question and does not relate to ACF specifically.
I suggest you look for coding techniques for doing what you want to do and for WP coding tips.
If you are using an image field https://www.advancedcustomfields.com/resources/image/ or a gallery field https://www.advancedcustomfields.com/resources/gallery/ there is documentation on the values you can from these fields.
If you have specific code that you need help with that relates to ACF you can post that and someone can try to help.
