Who's the target audience?
People who reads regularly and mostly 'how to' books
It's hard to keep track of all the information / knowledge learned from those books
Noteapp designed for book notes
Can I make this?
Yes, off the shelf editors combined with a regular review feature
Are they spending money on it / Whats the substitute?
Evernote, not taking notes, using other note taking apps
How will I get the first 25/250 customers?
Blog, press release, subreddit?
If it works, will it be sustainable?
Marketing for new book readers
Am I the person to build this business?
Yes, it scratches my own itch