Did you know that WordPress allows you to split a single post or a page into multiple pages? All what you need to do is just add <!–nextpage–> tag in your post or page textarea. So, if you have a very long article and you want to split it then just add Page-Link tag after each paragraph where you want to have a page break.
Why do we need Child Themes? If you want to modify a theme and you don’t want to lose your modifications then you have to create a Child Theme. Child Theme allows you to update the Parent Theme without impacting your modifications. So, if you want to change something in your current theme then you should do it through a child theme.