書き込む

1. Origins, structure, and basic meaning

• Structure: Written 書き込む and read かきこむ, it means writing information into a designated space or posting a message online.
• Basic usage: It appears when filling a schedule blank and when reviewing a question before placing it on a message board.

2. Common pitfalls and similar expressions

• Filling in versus posting
  • The medium determines whether the action is entering text on paper or publishing it to an online forum.