That may have been a bit wordy, but that was a four panel comic and yet that’s a concept that takes like 30 minutes in classes.  It’s not that bad, right?

.00000000001 =10^-11       Log 10 is the default (and what is used), so when it’s 10 to the power of something, you just take the exponent as the value.  Thus, you have -11.  Since the pH scale is based on the negative log (for that reason), the pH is 11.   Pretty straight forward.  Also, it is possible to have negative pH values.  For example, 12 M HCl (very concentrated hydrochloric acid) has a pH of around -1.08.

Also, OH- is basic.  H+ =acidic. OH- = basic. Done.