https://docs.onflow.org/cadence/
https://docs.flowfans.org/cadence/flow-kai-fa-gong-ju-jian-jie/fusd-fen-xi
https://testnet-faucet.onflow.org/
https://flow-view-source.com/testnet/account/0x6390905ee1d8a42e
https://swap-testnet.blocto.app/#/swap
https://flowscan.org/contract/A.01ab36aaf654a13e.RaribleOpenBid/overview
https://flowscan.org/contract/A.4eb8a10cb9f87357.NFTStorefront/overview
https://docs.onflow.org/fusd/transactions/
https://swap.blocto.app/#/teleport
https://github.com/rarible/flow-contracts
https://github.com/rarible/flow-sdk
https://docs.onflow.org/cadence/language/capability-based-access-control/