Please watch the new photoshop tutorial for beginners: "How to crop an image without changing the aspect ratio in Photoshop"
Black and white images with color Adobe Photoshop tutorials
Show in this Adobe Photoshop video tutorial how to use color black and white images in Adobe Photoshop CC.
Tools and shortcuts are used in this video tutorial
CTRL + + – for zooming in and out
black and white
There are a lot more……