To Get Started…
Here are the most commonly used keyboard shortcuts that are vital in speeding up your edits.
And here’s a list of all the tools available within Photoshop.1. Make a Circle from an Ellipse
When you want to draw a perfect circle using the Elliptical marquee, hold Shift. The ellipse will turn into a circle.
2. Get your Selection Back
Although it’s not very common to lose a selection, it sometimes happens. The simple selections aren’t a big deal but when you just spent a lot of time making the perfect selection and you lose it, it can be very frustrating. Press Control + Shift + D when you’re using Windows or Command + Shift + D on Mac.
3. Quickly Sample Background and Foreground Colors
There is an easier way to sample both background and foreground colors with Photoshop CC. Instead of just clicking on the background or foreground swatch as you used to do, click on the Eyedropper tool and click to sample a background color. Holding Alt on Windows or Option on Mac will sample a new foreground color. This clipping path company has also the best tool you can use if you want to cut out an object or removes the background.
4. Position a Selection or Shape
It happens all the time; you are making a selection or drawing a shape, and despite the shape looking the way you want, it’s not well positioned. You don’t have to draw your shape over. Keep holding your mouse down, as well as the space bar, to move the selection or shape to where you want. When you have it at the perfect location, release the space bar.
5. Quicker Way to Open Files
Whenever you want to open a file, you usually go to the Menus. However, Adobe keeps adding new shortcuts to make your life easier. When you want to open a file, just double-click on the gray background of the Photoshop window. This will make the File Open dialogue appear.
6. Change the Gray Inside an Image Window

Custom bluish-green background.
7. Hide the Selection Marquee
In some occasions, the selection marquee obstructs your view. So, instead of deleting and redoing it, you can keep the selection, but hide it. Press Control + H on Windows or Command + H on Mac.When you need it back, hit the same key combination.
8. Auto-Select a Layer
Instead of scrolling through all of the layers in order to find the one you need to edit or move, use auto-select. Hold Control on Windows or Command on Mac and click the layer desired from the canvas. This will automatically select whichever layer your cursor is over. There is also an option to toggle auto-select to always be on (on the upper left hand menu).
9. Line Up/Stack Palettes
When you’re using multiple palettes, it may get quite handy to have them placed in certain locations. With Photoshop CC you can move them wherever you prefer. All you need to do is to drag and drop the Palette from the sidebar.
10. Reset Dialogue Window Values

Cancel button turns into Reset button