It seems that Photoshop Beginners are often told not to worry about learning keyboard shortcuts until “later” – that using shortcuts is more “advanced”. To some degree that’s true, but at the same time there is a real advantage to starting to gradually add in keyboard commands to save you time.
So why bother using keyboard shortcuts? Why not just use the menus and the toolbox? Let’s look at a simple example. Imagine you have added a Layer Mask and want to paint on it, then move it. You move over to the toolbox to click on the Brush tool, before moving back to the image to paint on the mask over the right edge of the photo. Then you head back to the toolbox to select the Move tool before returning to the mask in the Layers panel once again. That’s a lot of real estate to cover!
To do the same thing using the keyboard (after adding the layer mask) you would press B for the Brush tool, paint, then press V for the Move tool. Much faster – and you only had to remember two keys.
And that’s really the point here: I’m not suggesting that you immediately attempt to memorize every keyboard shortcut for every tool and menu command. Instead I’m recommending that you look at the tools you use the most and learn the single letter keys to activate those tools. (Then over time, add in more tool shortcuts as you start to use those tools more).