Don’t forget the documentation site is searchable and you are advised to read the section on basics. It should have taken a few minutes at the most to find what you were looking for.
The page on the basics provides an overview of all of the built in trigger flows and is a good way to quickly peruse what is available.
All of the searching flows also have their own page providing a more detailed look at what they do.
Don’t forget, as per the docs, the advice is to use the external triggers over duplicating, unless you are tailoring the script. That way if I make any changes (improvements, bug fixes, etc.), they will be incorporated automatically for your own custom flows when you update the core workflow.
Yes. This is covered in the documentation for each of the search flows. Each uses a different repo file. For the scripting search you can find all the details here.