knowledge

• In the dark

  To be kept uninformed or unaware about a situation or details.

• Scratch the surface

  To deal with only a very small, superficial part of a subject or problem, implying much more remains to be explored.

• Universal truth

  A fundamental concept or principle that is consistently true and accepted by everyone, everywhere, and at all times.

• To lift the veil

  To reveal a previously hidden truth or to gain a deeper understanding of something that was obscure.

• a gold mine of information

  An extremely valuable source that provides a wealth of useful knowledge or facts.

• a font of wisdom

  Someone or something that is a rich and inexhaustible source of profound knowledge, sound judgment, or valuable advice.

• To be disabused of an idea

  To realize that a belief or misconception one held was actually false.

• Disabuse someone of a notion

  To correct someone's mistaken belief or false idea, often gently but firmly.

• Familiar concept

  An idea or notion that is already well-known or easily understood due to prior exposure.

• Beyond my ken

  Too difficult or impossible for someone to understand or know.

• The basic facts

  The essential, fundamental information or core details about a particular subject or situation, stripped of unnecessary embellishment.

• explore thoroughly

  To examine or investigate every aspect of something in great detail and completeness.