finishing the tree
What happens after I finish the tree? I reckon there is still to study a lot.:)
Yes. Finishing the tree is only the first step. All languages have 25 levels so you could always keep doing your lessons until you reach it or just stop when you feel that you are not learning or evolving anymore. Then, you should start using other resources if you haven't already. I'm assuming to finished your tree from Czech. Unfortunately there's no imersion from Czech but when you start getting more confortable in Spanish you could start imersion, translating texts from Spanish to English, and the other way around with the reverse tree. :)
Thank you! I've been reading a lot of stuff regarding that and it seems that someone who finishes the tree (without any other resources) can be considered somewaht between an A2 and B1. People who use other resources can become B2 easily. So having another opinion in the B1 direction is really good to keep myself motivated to use Duolingo because I'll understand a lot more than I initially thought I could.