How do I buy on Uniswap?

Could you please explain to me, step by step, how to purchase cryptocurrencies on Uniswap? I'm quite new to this and am feeling a bit overwhelmed with all the options and procedures. Would you mind guiding me through the process from creating a wallet to actually making a purchase? Also, are there any specific safety measures or precautions I should be aware of while using Uniswap? Your assistance would be greatly appreciated!