If you become an “expert” in Katalon Studio specifically, I would not say that you necessarily have sufficient Selenium knowledge to feel confident in a position that requires it.
The reason is that while yes, Katalon Studio is based on Selenium, if you’re just using the built-in keywords provided to you, all of that Selenium functionality is wrapped up into a nice neat package for you and you aren’t really getting any experience with the underlying technology.
The good news is that using tools like Katalon Studio will teach you other really important skills that come into play when working with automation software like Selenium. Skills like how to use DevTools, how to write locators (xpath, CSS, etc.) to target elements in a web application, or even just how to write meaningful and consistent test cases.
But don’t be discouraged. I think Katalon Studio is a really nice place to start. It can be a kind of sandbox where you can learn the basics, then if you want to start using Selenium you’ll have to tools to do so. I would also suggest spending some time learning the Java programming language (Katalon uses a form of Java called Groovy) if your goal is to learn how to use Selenium directly.
If you have more questions/want to discuss digging into test automation as a whole, I’d be happy to guide you where I can. Feel free to DM me 