"What does this field do?"
That can be the most embarrassing and challenging question I get from content authors when looking at an unfamiliar SDL Tridion setup simply because the entry forms are templates are configurable, programmable, and extensible.
Related to this is, "Where should we put these items?"
This one is slightly easier because the answer depends on the update process in terms of:
- Who updates them
- What types of items are they
- Where are they used?
- How frequently are they updated?
The answer to both these "what" and "where" questions should be a "how."