I read this question and realised that I don't know what the natural way to make a title/section heading is.
Supposing I had a section in a science report which was "Designing the experiment". What would be natural ways to write this? Here are some guesses:
1) feels wrong to me. I'm not at all sure about 2). 3) Seems okay but it only works because I used a する verb.
Presumably the context is important too. Adding こと in 2) sounds formal. I guess I wouldn't see that in a magazine headline. What about "Eating in fancy restaurants" as the title of a magazine article. Would the verb be 食べている, 食べる or some other conjugation?
In summary, how do you write "Doing X" as a headline/title/section heading in formal and informal contexts?