- Original List => https://en.wikipedia.org/wiki/Gallery_of_sovereign_state_flags
- Year of adoption => https://en.wikipedia.org/wiki/List_of_sovereign_states_by_date_of_current_flag_adoption
- Aspect ratio => https://en.wikipedia.org/wiki/List_of_aspect_ratios_of_national_flags
- Name => https://en.wikipedia.org/wiki/List_of_flag_names By continent => https://en.wikipedia.org/wiki/Category:Flags_by_continent
- Anthems => https://open.spotify.com/user/nfrancestates/playlist/7w2g4N2CWWeyysqaxWyLTU?si=xjSJ4nmORo-DOaxfJxfNiQ
- Hue groups => https://www.december.com/html/spec/colorhsltable.html
- Sort Colors => https://www.alanzucconi.com/2015/09/30/colour-sorting/
- Design => https://commons.wikimedia.org/wiki/Gallery_of_flags_by_design
- Refactor the code