Can you write a flutter application which is about music notes, guitar chords, hand exercise etc. you can put some of these information in the application and there could be

a login screen then you go to the inside then you could add these information into the application and there is few things important

Commercial (i.e. it could generate a profit)

Humanitarian (i.e. it improves quality of life in some significant way)

could be fun lastly it is up to you

the app shouldn't be so complicated but it would be better not to be so basic

if you could do such thing it would be so great for me