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Cross browser testing
When you use a certain browser every day, you might assume that everyone else uses the same one and can see exactly what you see on your computer. This, however, is not the case, as not all browsers work the same way, and your website may display and act differently on each one. Therefore you need to thoroughly test your website on all browsers (i.e. Chrome, Firefox, Edge, Safari, etc.) and all different mobile devices (i.e. iPad, iPhone, Android, etc.).
The best way to go about testing is to share the staging site link for your website with a few people on your team and ask them to click through every page and every link, making note of anything that seems off or broken. It’s important that one person doesn’t do all the testing by themselves so that you don’t miss anything! Then, this process needs to be repeated after the website goes live to be sure nothing broke during the launch process.