It is interesting to read this type of questions and even this article and see functional tester (beginner or advanced) answers.
I, just as you, enjoy reading various opinions on this topic types.
So one of the first rules of testing…Ask questions about the context.
I would try to understand what is a text field to that person asking.
Are we talking about a part of a text inside a paragraph? a text on a field(label)? a text inside a box(placeholder)? a text using a lawn mower on a field of grass? a text on a paper surrounded by a margin?
What is the person trying to figure out from me?
Is it how I think about a problem, how I find ideas, how I would write a test in TDD for that, how I would automate a check for that field, how I would present that feature in a demo, how I write test-cases…
What is relevant to the person asking the question?
How much time do I have to answer it?
How would the answer have to be? spoken/paper/digital/chatted?
From what perspective do I test?
What am I when I test it? A tester, a user, a person buying the software…?
And so on…
What interaction can I do with this text field?
Context about hardware and software of this field?
What does this field integrate with?
Who, how many, why, when…etc. users use this field?