Bullet Journal Hack COLOUR CODE - There's a book for that.
Extremely Useful Notebook Organizing Hack | Make:
3 Mini Notebook Hacks. At some point in your life, you've… | by Rocketbook Launchpad | The Launch Pad | Medium
Life Hacks. Your Future Target Searching, a Marker, Pen, Three Colored Pencils and a Notebook for Writing Stock Photo - Image of drink, desk: 193496362