Wow, thanks Arnissan and Harald for the answers!
First of all, sorry for the waiting time, I don't know why I thought that creating a message would automatically subscribe to the mail in case of answers but apparently not, so I didn't think I'd see any answers when I came back here ...
So, as I said, I'm not developed at all! So I'm going to try to put that into practice.
It's a shame there's no "practical" tutorial for all these steps yet, knowing how famous and useful Spine and Bolt are! :p
Harald I had indeed seen this link, but then it didn't tell me much, as I said, I'm not a dev.
Arnissan, with this example if I understand well, we can select the type of Skin and animation according to the actions?
I'll try to understand and test it!
Thanks a lot!
If someone sees any tutorial to use Spine and Bolt in Unity (for peoples really bad in code) I'm interested :p
Thanks again