Generally it is well-known that's introductions involve writing a short passage on the subject. The important point about writing a good introduction is to make it catchy to the reader. In order to do this it must capture the essence of the story and bring out this essence through an example. This is important as otherwise you won't be capturing the real essence of the story and people will read only just a few lines.
If you're going to start writing, make sure it's short intro. When readers see a headline they expect the writing below it to contain content which relates to that headline. There's only so much time a reader will spend with an intro about sports when the headline suggested the article was about vacations.
Furthermore, you may have captured the essence of the story very well in the intro, but you have to ask yourself the question.. is the intro short enough to engage reader interest before the content return to elaborating on the subject a hand?
In this piece above, you can see that the intro is pretty short. This is the kind of intro that works with the audience because the reader is aware of what they are reading and absorbing it fully. The reader knows what the article is about in a broad sense and therefore they know what to expect inside the story.
Starting with a long introduction that appears to bear no relevance to the headline is the number one killer of otherwise good writing.
In case you use big anecdote, you must let your reader be aware of how it is connected to your subject, otherwise you will find that readers will opt out of reading your topic, even before you bring out your point.
More essence in fewer words; the function of an introduction is to convey something about your broader point.
So, what you need to do is think about your intro is a broader sense and then bring out details that will help to bring this forth clearer and omit those which don't. It's better to leave out details such as dates, names, descriptions and diversions when they are not relevant to the main point presented in the anecdote, as they will not distract the reader from the real point you wish to make.
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If you want to grab the reader's attention you must pay attention with the introductory passage. This is the lead in for the rest of your story. Think about your intro as a whole and consider which details help do this and which do not