In this tutorial, by Jesús Ramirez from Photoshop Training Channel you will learn how to sharpen images in Photoshop.
When sharpening photos in Photoshop, it is important to understand that the sharpening adjustments that we apply do not add any new detail to the photo. In Photoshop, we can only create the illusion of sharpness by increasing the contrast of edge pixels. Making it seem as if there is more detail in the image.
If the sharpening is pushed too far, it can create edge halos or increase noise in the photo, so it is always a good idea to keep your adjustments as subtle as possible. Just watch this video tutorial and learn how to properly sharpen images in Photoshop