Possible new job which uses WPF

Allthough I am not new to programming. I know a few languages and front end web techniques, but don't know everything of course. I have the oppurtunity to work at an application which uses WPF, I have never used it before, I know it's like 18 years old. I have seen on youtube that it's still relevant.
I wanted to ask redditors, have you used it, do you think it's a good technology to learn? Do you have any tips where to start?