Silence the Bell
I am going to go out on a limb here, and presume you have at some point heard a little "duhm" noise when trying to scroll to far, or backspace when a box is empty, or some similar basic error. I happen to find these little reminders quite informative, but to some people they can be plain annoying.
Fortunately there is an easy way for you to disable it, either using dconf-editor to uncheck audible-bell in org > gnome > desktop > wm > preferences, or by executing the following command.
You can enable it again either by re-checking that box, or by changing false to truein a similar way.