Katalon Studio is a test automation tool that is based on Selenium. If you know Selenium, using Katalon keywords will be simple to learn since they are just a wrapper around Selenium methods.
Now, you can use Katalon in a variety of ways, one of which is the script mode. That is the "coders" way: you write the test script in Groovy programming language.
Another way is to use web recorder (spy/record mode in Katalon Studio, or Katalon Recorder - a browser add-on). This will give you the script code without you having to do any programming. I'm guessing that is what you are now saying: "If a tool can give me the code, why would I need to learn how to code"?
Well, you don't need to, but it is a very useful skill. And scripts that you wrote yourself would soon be much superior to those made by a web recorder. They tend to be very fragile, have a lot of useless code and are, in my opinion, only good for very simple scripts and for beginners. So, don't be afraid of code, you will soon prefer it to codeless solutions.