How do you know if there's a space to write an article on the 1st page on Google? (example in post)

So many times when I write a keyword - lets do a random example - "do birds eat bread" .

And what I see now in the results is "What scraps can I feed to birds"And then "Is bread bad for birds?"And then "Feeding your backyard birds"And then "Is it OK to feed bread to birds"etc.

And no one has in the title "Do birds eat bread"

So, what I don't understand from this is does this mean the keyword is already taken, even though the results I see are kind of the same but not completely? Or does this mean there's space to write an article about this?

And when I look at those number 1 websites, they all seem to have a good authority.

If you have any examples on keywords for which there IS space to write an article, that you know for sure, I'd deeply appreciate that, just so I can understand how that should look like.