Relying heavily on knowledge you've gleaned from Volo’s Guides, you've established yourself as a fairly reliable source of information on certain subjects, though not without some mishaps.

Choose from among Arcana, History, Nature and Religion: gain proficiency in one (or Expertise if you’re already proficient), gain Advantage with a second one, and gain Disadvantage with a third one (though you're as confident in the reliability of your knowledge in this third skill as you are of the others).