Any tips on using ND Filters?

I bought three ND Filters for my Nikon today in hope of perfecting my photography. Now, so far most of my work has been classed as 'snapshots' (totally agree, check Instagram: @ishayc0). After setting up my Flickr ( https://www.flickr.com/photos/100532881@N03 ), I wanted to start using said filters for daytime long exposures. However, I'm not quite sure what you would use the filters for (I know, bad idea buying without Really knowing). So I thought maybe someone can point out their main uses and what situations to use them in.
Filters are ND2,ND4 & ND8.
Thank you.

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What would be a good tripod that can support my lens and my camera?

OK I am looking for a good tripod that can support my Nikon d3200 and my Sigma 150-500mm(i gave a pic of what the lens looks like). Thanks!

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Is the Tamron Lens Compatible With the Nikon D300?

Is the Tamron Lens Compatible With the Nikon D300? - 1

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What nikon lenses are good for a beginning wedding photographer?

What nikon lenses are good for a beginning wedding photographer? - 1

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