There are lots of training videos that share the same niche brainstorming and finding methods.
Here's what you usually do:
- Brainstorm ideas from magazine, book websites and affiliate networks,
- Do keyword research on Google Keyword Tool
- Use your own common sense to look out for good niches
Think about it, if all the training out there is teaching the same tactics and every one does the same thing, what makes you stand out?
If everyone uses the same tactics, they will probably find the same