Which of them defines important text <strong> or <b>?

Answer 1

It's obvious <strong> defines an important text while <b> just makes the text bold.(Atleast, this was written in the lesson)
For knowing more about difference between <b> and <strong> tag:

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https://www.sololearn.com/discuss/52414/?ref=app

Answer 2

<b> makes it bold, <strong> is something if its big in importance.