下段

1. Origins, structure, and basic meaning

• Structure: 下段 (かだん) means the lower tier of something divided into levels. 下段に置く marks placement; 下段には topicalizes the area where information is entered.
• Basic usage: A heavy box goes on a shelf's lower tier, while contact details go in the lower section of a form.

2. Common pitfalls and similar expressions

• Lower shelf for an object and lower form section for text
  • Reference nouns 棚 and 申込書 select a physical shelf or document region. には adds topical focus to the location rather than changing the lexical meaning.