–Actions are a recorded set of editing steps that you “play” in Photoshop. Once you hit play, it follows the steps of the edit and adds the effects to your image. Actions are not compatible with Lightroom. You can read more about getting started with Photoshop Actions, here.
–Textures are a patterned image that you drag and drop onto the photo you are editing. You can adjust the blend mode and opacity and it adds the patterned effect to your image. Textures are not compatible with Lightroom. You can learn more about how to apply textures, here.
–Overlays are similar to textures, only they aren’t “patterned” with a texture-like design, and are sometimes transparent. They can be dragged and dropped onto the image you are editing, and you can adjust the Blend Mode and opacity for different effects. Overlays can come in many different designs. There are Sky Overlays (which are not transparent), there are Overlays that have Sun Flares or other effects, and some that may be solidly-colored or swirled. Overlays are not compatible with Lightroom. You can read more about getting started with Sky Overlays, here. To learn more about how to apply regular overlays, click here.