What happens when I sell on Kraken?

So, I'm curious, what exactly happens when I decide to sell my cryptocurrency holdings on Kraken? I'm interested in understanding the process from start to finish. Do I simply click a button and the funds are automatically transferred to my bank account? Or is there more to it than that? I'm also wondering about any potential fees or charges that I should be aware of. And lastly, how does Kraken ensure the safety and security of my transactions? I'd appreciate any insights you can provide on these topics.