How do I cash out crypto to fiat?

I'm curious to know, how exactly does one go about cashing out cryptocurrency into fiat currency? I've heard that the process can be a bit tricky and I'm looking for some clarity. Could you walk me through the steps, from selecting a reputable exchange to ensuring that the transaction is secure and successful? Additionally, are there any potential fees or taxes that I should be aware of? Your guidance would be greatly appreciated.