It's not important I'd say, you can absolutely get by just knowing the basics which you can largely copy and paste from elsewhere, and Android Studio handles much of creating a Gradle file for you.
IMO Gradle is quite an advanced topic that I wouldn't expect beginners to know an awful lot about.
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What about how to build the project?
I have to use Maven heavily in my work, and I don't have much exposure to Gradle. How important is it to understand Gradle?
It's not important I'd say, you can absolutely get by just knowing the basics which you can largely copy and paste from elsewhere, and Android Studio handles much of creating a Gradle file for you.
IMO Gradle is quite an advanced topic that I wouldn't expect beginners to know an awful lot about.