置く

1. Origins, structure, and basic meaning

• Structure: 置く(おく) means to put or keep an object in a place.
• Basic usage: It describes putting a book on a desk or keeping a stamp by the entrance.

2. Common pitfalls and similar expressions

• The object and its location
  • In 本を机の上に置く, を marks the object and に marks where it is placed.
• The resulting state
  • 置いてある describes the continuing result of someone having placed something there.