Bat file is needed to provide your wallet address, rig ID, other settings to the mining software. Every mining software has a different structure of this file.
We provide the example of the bat file for every coin at the help section "How to start".
Usually, all you need to do to start mining is -> download recommended software and make the bat file substituting the wallet address and rig id in our bat file example.
2Miners mining pools: https://2miners.com/
2CryptoCalc mining profit calculator: https://2cryptocalc.com/