Look for Contrast, Shape and Texture
By shooting in black and white, you can remove the distraction of color. That means there’s more focus put on other aspects of your photography. That can include things like the subject, shapes, textures, lighting, contrast, and composition.
This makes black and white photography ideal when you’re experimenting with different types of photography. It’s also useful when you want as much attention as possible on a particular element in your photo.
How to turn a photo black and white in photoshop
Open: your image in Photoshop.
Go to the Layers panel (Window > Layers) and click the new adjustment layer icon (a circle that is half black and half white) or Choose Single Adjustments from the Adjustments Panel.
Select Black & White from the menu.
The image will instantly convert to black and white.
In the Properties panel, you can adjust the sliders for different color ranges (like Red, Yellow, Green, etc.) to control the brightness of those colors in the final black and white image.