An adjustment layer applies color and tonal adjustments to your image without permanently changing pixel values. So for example, using adjustment layers is adding different effects/tones to the image you are editing. With using adjustment layers, you can easily delete them without ruining or complicating your image.
What is 'hue/saturation?'
The Hue/Saturation command adjusts the hue (color), saturation (purity), and lightness of the entire image or of individual color components in an image. You can use the Hue slider to add special effects, to color a black and white image or sepia effect or to change the range of colors in a portion of an image.The hue and saturation simply makes your image another colour and how bright or dark you want the saturation to be.
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| This is before using Hue/Saturation |
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| After using Hue/Saturation |
Show how opacity works
The Opacity level is a feature in Adobe Photoshop which allows you to make layers more or less transparent. It is scaled on a measure of 0 - 100, with 0 being 100% transparent and 100 being 100% opaque.
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| Scaled measurement of 0-100 |
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| With using Opacity |
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| Without using Opacity
Black&White
To get the black and white effect, you'll have to find it on adjustments like the rest of the tools. Once you've clicked, it should automatically give you black and white effect without changing the other options. 
Curves
Curves on Photoshop gives you different kind of highlights depending which you curve it too. For example, moving a point in the top portion of the curve adjusts the highlights. Moving a point in the center of the curve adjusts the mid tones, and moving a point in the bottom section of the curve adjusts the shadows.
On the picture below, I have messed around with the curves and this is the kind of effect it gives you.
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