I'd like to know when to use "ideas on" and "ideas for". I think these are correct:
- I'd like some ideas on how to improve my team.
- I'd like some ideas for improving my team.
- I have some ideas on that subject.
This feels less correct to me:
I'd like some ideas for how to improve my team.
This feels plain wrong:
I have some ideas for that subject.
However, I don't know why. Which phrase should I use, and when?
Edit: I'm specifically interested in the grammar breakdown — is that last one wrong because it's a noun? What about "how" — how does this change it? What are the rules?