YOU SAID:
I forgot all about this website
INTO JAPANESE
私はこのウェブサイトについてすべてを忘れました
BACK INTO ENGLISH
I forgot everything about this website
INTO JAPANESE
私はこのウェブサイトについてのすべてを忘れました
BACK INTO ENGLISH
I forgot everything about this website
That didn't even make that much sense in English.