Welcome to Lane IT!
If you're like me, taking my had off the keyboard to push the mouse around feels like a big time waste sometimes. In my day to day work I use keyboard shortcuts to bring up settings, change formatting in text editors... There are a ton of things you can do with just a few quick keystrokes so you don't have to take your hands off your keyboard. Jira is no different. To see what keyboard shortcuts are available, just type a ? (shift-/). That will bring up a screen that shows you all the keyboard shortcuts that are available inside Jira. Pretty long list, so don't try to use them all at once. Find one that will be really useful, use it for a few days so it becomes habit, then pick another one ...