Apple are really nosy, so now they would like to know what it is that you’ll be getting up to. The questions are aimed at app developers in general and some may not apply to you, so just try to answer them to the best of your ability.
I’m not really sure what they need this information for, other than internal R&D (research & development) on app developer usage, however they won’t let you past unless you cough up the answers.
I will admit that the last question is a bit iffy (“Do you develop on other platforms?”) and I normally answer with NO… just to be safe. Everyone knows that it’s a competition between different operating systems (e.g. Android Vs. iOS) so, as an app developer myself, I wouldn’t want to get on their wrong side.
Just do what you think is right and click “Continue”.
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