The inverted pyramid is a writing technique used in news stories. It's called a pyramid writing style but it's easier to think of it as an upside down triangle with the point at the bottom and the flat edge at the top.
With news or short non-fiction writing, the flat edge is your start and the point is your end.
With an inverted pyramid, you start with your entire news story in the first paragraph. If someone only reads that, they must still get the whole story. For an example, look at any newspaper and especially at breaking news stories. The first paragraph gives you all the essential facts, and each successive paragraph is less and less important.
Pyramid writing was allegedly invented to solve a specific technological problem that faced newspapers in their earliest days.
Writers would type their stories on paper and send them via the editor to the composing team. Designers there would use scissors to trim the paper and then assemble all the stories on one larger piece. This was genuine cutting and pasting and it is where we get that term from.
Every writer would have been given a length to write to and probably every writer exceeded it. But even if they all wrote exactly to the length they were given, a late piece of news would break that was more urgent and had to go on the front page.
Then the other stories would hang over the bottom of the page and there was no option: the composing designers had to physically chop the end off. This always happened at the last minute, it was always up against print deadlines, so there was never time to have great editorial debates about where exactly to cut.
So we got the pyramid idea. If you write in this manner, then a designer can slap your copy on the page and, without even reading it, know where to cut. The ideal is to keep the complete story but they know they can simply chop off the last paragraph. And then the one before that. And the one before that.
If they end up with just a headline and one single paragraph, the story still works. It was a straight technical requirement but the result is the core style of every printed newspaper you've ever read.

1) In spite of the headline the article is
2) The structure of a news story can be likened to
3) In news stories key information is given in
4) The technique was invented to deal with
5) The computer term "cut and paste" goes back
6) Articles sent in rarely kept to
7) Scissors were often applied when putting together