How much does it cost to buy on Uniswap?

So, I'm curious, could you tell me, how much does it actually cost to buy tokens on Uniswap? I understand that there might be some fees involved, but I'm trying to get a clear picture of the overall cost. Is there a set fee for each transaction, or does it vary depending on the amount you're buying? And are there any other costs that I should be aware of when using Uniswap? I'd really appreciate it if you could clarify this for me.