Cardano (ADA) subReddit: https://www.reddit.com/r/cardano/
Cardano Block explorer: https://cardanoexplorer.com/ & https://seiza.com/home
Cardano wallets: Daedalus wallet, Yoroi Wallet, & ADA Lite (can access on Trezor hardware wallet).
Cardano Whitepaper (academic papers)
Buy Cardano merchandise: https://cryptosupreme.net
Some helpful Cardano links – Cardanians.io, ADA Pools,
Cardano – Simply Explained