How to swap on zkSync lite?

Could you please elaborate on the process of swapping on zksync lite? As a beginner in the cryptocurrency space, I'm curious about the steps involved and any pre-requisites I might need to consider before initiating a swap. Additionally, how does zkSync lite ensure the security and speed of the swap transactions? Lastly, are there any fees associated with swapping on zkSync lite, and if so, how are they calculated?