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All right so here comes the answer.
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Before you do anything I recommend reading through the docs and seeing how these parameters work.
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And remember that we're using the colon and then we're going to give our parameter a name so that we
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can tap into it later on using req.params. the name that we specified.
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So now we can head into our app.js and you can create that route any way you wish.
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I'm going to put it just before the end right down here
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just before my app.listen. And I'm going to say app.get  and then I'm going to specify /
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posts/: and then here comes the name of my parameter which you can call anything you
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wish as long as it makes sense to you
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but I'll call it postName. And then I'll add my callback, my req and res and then inside my callback I
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am going to tap into that parameter called postName.
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So I want to console log it. So I'm going to log the req.params.postName. And it has
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to be spelt exactly the same as you see here after the colon.
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But there's no colons down here
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remember that. This is all that you need in order to tap into a dynamic
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URL right?
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Because we're using this parameter to decide what it is that we should do inside our app.get.
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So we can now say if they said I wanted you know the post that has a post name of testing then we will
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send them over there
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and if they wanted the post that had a name of ordinary I love pets then we will show them that page.
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So this is the first step towards getting a dynamic website created.
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And this is all down to using Node and Express, nothing else.
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Now we can test this and if we head over to posts/ anything you want to write afterwards then
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it will get logged down here in our console.
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So this is the first step towards achieving our dynamic website and feel free to mess around with it,
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try out different parameter names, try out multiple parameters as you can see where they've got
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this one which is a single parameter and this one which is another parameter
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and you can actually tap into both just by using req.params. the name of your parameter in your 
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URL.
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So play around with that and once you're ready we'll head over to the next challenge.