Routinely browse the website to make sure crucial elements look and function properly.
When you perform regular maintenance on your website (like plugin, theme, and core updates) you might be affecting the functionality and/or the aesthetics of your website. These could be unwanted changes that negatively affect visitors experience on your website.
These things can be hard to detect with any automated systems, however there are some cool visual regression tools on the market.
The easiest solution is to just browse the website after major updates to ensure key components are functioning properly. A quick visual inspection of the most important pages will help give you peace of mind.
If you’ve updated a specific plugin, visit the areas of the website where that plugin is used and ensure they still look and function as intended.
It’s my experience that most updates don’t cause problems— but it’s better to be safe than sorry!