Hello,
For myself, I read some books and have some more to read.
I subscribe Pentester Academy, and soon I will finish the "Web App PenTesting.”
I play a bit with attackdefense.com (bundle with Pentester academy) too.
And I start playing with retired machine here, since the easy one are already hard for me :).
But it’s a long way 
so I take my time !
Well, to answer, PTA is very cool but a bit old.
But there is a lot of valuable info, and knowing old methods can always be useful.
Hope this help