Any minimum threshold to buy R3FI on uniswap

Any suggestion for first' time buyer. I have no any experience in uniswap defi. I have searching and find uniswap was legit and billions $ suppllier.
UniSwap is the largest decentralized exchange on the Ethereum network. You can trust using it. When using it though you need to set slippage to atleast 6% in the settings, as well as using a whole number of R3FI tokens such as 15,000 R3FI.