Following is a list of links pointing to various Cardano related resources.

Official Cardano website

https://cardano.org

Yoroi and Daedalus, the official wallets

Follow links from official Cardano website https://cardano.org

Cardano Foundation

https://cardanofoundation.org/

IOHK the company behind Cardano:

https://iohk.io/en/

Cardano white papers

https://iohk.io/en/research/library/

Community forums

https://forum.cardano.org/

Community Discord channel

https://discord.gg/2DgeRkbh9q

Cardano Official @ Telegram

https://t.me/Cardano

Cardano stake pool best practices workgroup @ Telegram

https://t.me/CardanoStakePoolWorkgroup

IO SPO Announcements

https://t.me/SPOannouncements https://mailchi.mp/iohk/spo (newsletter)

Github code repositories

https://github.com/input-output-hk

Cardano community produced FAQ

https://cardano-community.github.io

Blockchain and Pool explorers

https://explorer.cardano.org/
https://cardanoscan.io/
https://adapools.org/
https://pooltool.io/
https://pool.pm/
https://pool.vet/
…and many more

Why Cardano?

The original essay from 2017 outlining the background, philosophy and inspiration behind the Cardano blockchain. By Charles Hoskinson.
https://why.cardano.org/