Following is a list of links pointing to various Cardano related resources.
Official Cardano website
Yoroi and Daedalus, the official wallets
Follow links from official Cardano website https://cardano.org
IOHK the company behind Cardano:
Cardano white papers
Community Discord channel
Cardano Official @ Telegram
Cardano stake pool best practices workgroup @ Telegram
IO SPO Announcements
Github code repositories
Cardano community produced FAQ
Blockchain and Pool explorers
The original essay from 2017 outlining the background, philosophy and inspiration behind the Cardano blockchain. By Charles Hoskinson.