1-Funding a Smart contract with minimum required amount in Eth 2-we use chainlink MockV3Aggregator to the latest price of a pair and convert it to usd minimum price 3-withdraw the funds by the owner of the contract 4-change the balance of smart contract to 0 while the owner of the contract run withdraw () 6.we use brownie framework to manage the accounts ,tests and networks (developments and Ethereum) 7-hands on presistance and temporary network