Where do I start?

To get started with plugin development, first we need to decide what problem we are trying to solve or what functionality we are trying to implement.

Let's assume that you have a website with various phone numbers listed on the site, and that this site is popular with people who access the site through a smartphone. Currently, to call one of the numbers, the user has to remember the number to dial it, or perhaps they jot it down on a piece of paper or attempt to select and copy the number through their browser. This is not very user-friendly, a much better way to do this would be to change the phone number to a click-to-call link, so the user can just click the phone number and their phone will call it. Now, you could go through the website and manually change all the phone numbers to these links, but that would be inconvenient. Assuming our phone number is in the format 1234-5678, we could change it to this HTML code to create a click-to-call link.

<a href="tel: 1234...