I haven't trade any coins there yet, but my friend said you must have at least 0.05 - 0.1 eth. You must prepare enough gas to buy any coins on Uniswap, mate.
0.05eth is worth only for fee. Also you must trade 1 eth higher in order to have a good profit when youre lucky. The fees now on uniswap are ridiculously high so below 1eth trade is not worth it cause you need to prepare at least 10$ average fee for every trades. So I think uniswap is not for small traders, better to use cex for that.
The transaction value at Uniswap is currently quite high, perhaps this is why gas fees are quite high on the ethereum network. Currently, the gas fee for ethereum's network reaches 155 gwei and when compared to several months ago, the fee is almost 3 times. But there are many tokens that are transacted at Uniswap whose prices have increased quite high and I think for some people, transaction fees of that size are not a problem.