(https://www.nyip.edu/images/cms/photo-articles/3-simple-photoshop-shortcuts.jpg)
When it comes to working in Photoshop, keyboard shortcuts are an incredibly useful tool for you to master for the sake of efficiency and time saving. Getting started here are 4 helpful shortcuts you can try next time you reach the post production portion of your workflow:
Spacebar + CMD (CTRL) + Click and Drag - this lets you quickly zoom in and out of whatever portion of your image you want to look at from a closer/further perspective
CTRL + ALT + Click (RIGHT Click) and Drag - When you start dragging left or right, the brush size will change. If you drag up or down, the brush hardness will chang
OPTN (ALT) + CMD (CTRL) + SHIFT + S - This is an easy way to save any images you intend to share online (the quality will adjust accordingly).
Source: https://www.nyip.edu/photo-articles/archive/3-simple-photoshop-shortcuts