Post in Post or snippets

Hi
I am writing a series of support articles for some one, and I would like to be able to build a library of repeatable ‘mini’ posts which can then be re-used within the main article i am writing.

To me this is either snippets or some sort of post in post set up.

I have been looking at the plugins and those that seem to meet my criterion do not seem to be actively supported or updated anymore – 1 to 2 years since last update.

I don’t know the reason for this but I am hoping its because this (post in post) is easy to do without a plug in, or snippets are now known as something else.

Any advise gratefully received.

Dave
PS – I am not a programmer so either this needs to be fairly simple to do, or to use a plugin.