I find it helpful to look up the definitions of terms I'm not familiar with. Anyhow, wei are a unit of gas, since you usually pay for gas in ETH you can just t

I find it helpful to look up the definitions of terms I'm not familiar with. Anyhow, wei are a unit of gas, since you usually pay for gas in ETH you can just think of it as paying small amounts of ETH. For the Uniswap price question, just look up the formula. Leverage is provided presumably against some collateral. You chain contract calls to make them execute in the same block. It's more of a side effect of how time works when dealing with blocks rather than something you have to try hard to do.