To share decks with the general public, synchronize them with AnkiWeb, then log into AnkiWeb and click on "Share" from the menu next to the deck you wish to share.
If you shared a deck previously (including with previous versions of Anki), you can update it by clicking "Share" as above. Updating a shared deck will not reset the download counts or ratings. You can delete a shared deck that you have uploaded using the Delete button on the shared deck's page.
When updating a deck, AnkiWeb expects the deck to be at the same location as before. If you shared a deck when it was called "Korean Verbs" for example, and then renamed it to "Korean::Korean Verbs", resharing will not be able to update the existing copy. If you have forgotten the original name, please contact support.
When you update a shared deck, users who downloaded the deck previously will not automatically receive updates. If they download the deck again and re-import it, newly added material will be imported without altering their existing study progress, provided neither you nor the user has altered the note type since the first import.
If you’d like to share decks with a limited group of people (such as a study group or class) rather than the general public, you can do so by sharing them outside of AnkiWeb.
To share a deck privately, go to the File menu and choose Export. Select a single deck (not "All Decks"), and turn off "include scheduling information". This will produce an .apkg file which you can share with others.
You can share the .apkg file by emailing it to people, placing it on a website or shared folder, or using a free file sharing service like Dropbox or Google Drive and sending people a link.
Both the computer version and mobile clients make it easy to import from an apkg file simply by clicking or tapping on it. AnkiWeb does not have the ability to import apkg files however, so the recipients of your deck will need to have the computer version or Anki on their mobile device.
When a user imports an .apkg file, cards that already exist in their collection will be ignored and any new cards will be added. As long as they use the same note type, modified cards will also be updated. To prevent data loss, cards that have been deleted in the new apkg file will not be deleted in the user’s collection, so if you need to delete cards from users' decks for whatever reason, you will need to contact them about it.
Please see https://addon-docs.ankiweb.net/sharing.html
Please see https://translating.ankiweb.net
Anki's source code is available at https://github.com/ankitects/anki
Before contributing, please see the README.contributing file in that repo.