A sure-fire way to prevent your Mac from slowing down and avoid errors like "Your startup disk is almost full" is to ...

Every website you visit installs trackers onto your computer and slows it down subtly. These are called cookies and cached data, which work to track your activity if you regularly visit the same site.

There are several good reasons to clear the cache on your Mac. It can help protect your privacy by removing stored personal data, fix misbehaving applications that aren't working properly, and free up ...