How to check suitable version of components in qt

[JANG SOONMYUN]

I'm using QT 5.15.
However, whenever I refer example codes from others, people use different version of QT so that also component module versions are different.
How could I check suitable version of each component module?

[jsulm]

@JANG-SOONMYUN What components do you mean?

[JANG SOONMYUN]

@jsulm I meant modules such as
import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick.Controls 2.15