If you find yourself spending a lot of time at a desk and staring at a monitor -- mostly likely at home these days -- it's important to think about the ergonomics. Sitting in one place for long periods of time is already not good for you, and it can be even worse if you're sitting in a bad position. Fortunately there is one extremely easy thing you can do to improve the ergonomics of your workstation pretty much no matter what: make sure your monitor is the right height.
An improperly setup screen can cause neck strain if it is too high (as external displays often are) or too low (as many laptops are, especially if they're on your lap). To be in the right zone, make sure the top of your screen is at eye level.
For a monitor that is too high, you can either lower it as much as you can and/or raise your chair to match. For laptop screens that are much too low, place your laptop on a stand or stack of books, and use an external mouse and keyboard.
It's a small change, but an easy one that will make your life much more comfortable. You've got no excuse to not do it right now.