To get started with Modding for Minecraft for Windows 10, you have two basic options:
Younger kids might enjoy the MakeCode solution at:
You can also try the new Minecraft Scripting API which is found here:
This is not the most well-documented thing ever invented, but you can get help from someone who created an npm package to do the hard work for you:
His introductory video on how to use this is here:
There are other videos you can watch to add more features to your scripts.
Series from TheSourceCode:
Thanks to everyone who attended my talk Cure Your Fear of Git at TechBash 2019.
I keep my materials in a git repository for the conference. This is easier than updating a blog post as things change or attendees ask questions I will get to later. At some point, I may move the content to the blog and remove the link and repository. But for now, head here to get the slides and notes: