A significant number of questions asked in MSE begin or end with "I don't even know where to start", as a way to justify one's inability to provide own work on the problem and/or attract sympathy or rather pity.
Most of these questions end up [on hold] within half an hour, because of course this doesn't attract sympathy at all. This is a waste of time and energy for everyone, including the OP, the five reviewers who are going to close the question, and the good Samaritan who has answered in the meantime.
There are plenty of ways to get started on a problem when one has "no clue":
- Write down the definition of the keywords of the problem, thus making sure you understand them, using examples ($\star$) when applicable;
- If the problem involves formal computations, try with specific settings first ($\star$);
- If the problem involves large structures or numbers, try with lower numbers first ($\star$);
- Write down what you know that seems related to the problem: any relevant theorem not in that list will be spotted right away and people will point it out easily.
($\star$) you have to make them up yourself, and that very process is excellent to make progress in the way you think in general, what is a good, representative example in a given situation?
I suggest that the Ask Question form could suggest that, if one ever feels like including "I don't even know how to even start", one could consider trying one of the options above instead, to save time and energy for everyone.
A kind of "I'm not a robot" feature.
Edit: I wrote an answer to How to ask a good question based on this post, following the recommendation of @Jack D'Aurizio. It is community wiki, feel free to improve it.