Basics

Market data: https://www.coingecko.com/

Market data: https://coinmarketcap.com/

Futures market data, charts, info: https://coinalyze.net/

Blockchain explorer: https://www.blockchain.com/

Tools & charts: https://www.blockchaincenter.net/

Tools & charts: https://alternative.me/crypto/

DeFi

Revenue, fees, TVL & more: https://tokenterminal.com/terminal

Yields, Airdrops, TVL & more: https://defillama.com/

Token comparison: https://www.marketcapof.com/

Dapp Info: https://dappradar.com/