How to use Photoshop gradients and layer effects incl overlays, strokes styles for CC 2017 / 2015 CS6 CS5 CS4 tutorial
You can use the Photoshop gradients in the stunning color effects in the layer effects' gradient overlay, glow and stroke settings.
To display the overlay etc you first have to be on a layer and select the layer menu layer styles panel and in that you will see a number of panels such as overlay, pattern, bevel, stroke etc though this list will vary depending on the items added or removed and there may be more than one or two entries for the shadow / overlay etc (this only applies to the latest versions of Photoshop / creative cloud).
It may be the case that the gradient overlay is not even on the styles panel list so you will have to go to the bottom of the panel list and select the 'fx' dropdown and you can then select one of those options such as adding a gradient overlay. Goto that gradient panel you will see a number of different controls on the panel such as gradient style, etc. The gradient style can be changed from linear to radial and angle etc. Each layer style panel has its own way of using the presets.
Once you have a panel with a gradient option (the list of the panels with the gradients is below) you can select any of the available Photoshop gradients. The gradients may be the default set of gradients but you can always add other gradients such as your own or ones from this site
You can also just go to the styles panel entry at the top left of the layer styles dialog and select one of the presets, these maybe one of the default preset styles or perhaps one of your own styles and there are also many other styles available such as 7000 Photoshop styles and layer effects set
The layer effects dialog has a number of options. The overlay can be applied using different style such as linear, radial, diamond, angle and reflected; the angle and opacity and blending modes can also be changed. With the most recent version you can now more than one overlay via the '+' on the panel and you can then blend those. When you add more than one overlay, if you want to see the items below you will have to work in the order of the layers within the panel so it is no use working with any overlays lower down if the blending mode or opacity prevents that overlay being actually seen.
You can add up to 10 overlays and use the blending modes such as darken or lighten or difference etc or set the opacity to 50% etc. You can use the same style such as linear etc throughout or you can combine multiple different styles in the panel so one can be radial and one can be linear etc.
You can use the same preset as well as different presets and perhaps from different preset libraries.
The stroke can be set to color and pattern and gradient. The GRD option also allows for a variety of types such as shapeburst as well as the normal ones such as linear. If you use the smart object option (for the layer) you can generate multiple layer effects for the same shape layer, multiple strokes, too. To use them in the layer effects' stroke option and the shapeburst, it is best to set the size to a large value
The inner glow can be applied to create interesting fills for any shapes / layers in Adobe ® Photoshop ®. You can set the source / choke / size of the inner glow for the preset.
You can also modify the inner glow by using the contour option which can tighten or stretch the preset (it is a pity that the stroke and other options cannot access the useful contour options).
You can also set the blend mode for the inner glow (luminosity etc) and these can also be used to create interesting layer effects combined with other options.
The opposite of the inner glow. The difference is that the outer glow is influenced by the background as well as other layers. You can combine multiple shape layers with the same presets (as outer glows) or different ones to create many wonderful images.
You can, of course, take the presets and turn them into a pattern and as a pattern it means they can be used in other areas of the styles panel such as the texture section for the bevel.
A very basic preset probably won't work but you can always combine multiple presets using blending modes (using a large document) to create a very complex and intricate artwork and perhaps combine with effects such as poster edges or noise and then define that as a pattern (albeit not a seamless one) and then use that as a texture or perhaps as a pattern overlay which can also be combined with the main overlay
You can use the styles created using the Photoshop gradients with custom shapes, simply apply via the styles panel to shape layers such as scroll and curled embellished custom shapes along with some more slightly odder designs such as interstellar / space / alien custom shapes and a slightly more jazzier set of artworks such as art deco thirties themed step custom shapes You can also use the layer styles with fonts etc such as star and starry fonts and eps shapes
You can find many additional tutorials such as how to use the Photoshop gradient maps adjustments feature to add amazing color effects and how to use Photoshop gradients across channels such as in RGB channels and separate channels and a useful tutorial on changing the color of the presets in Photoshop such as how to change the fill color properties of custom shapes such as using gradients and patterns and solid colors tutorial