Diploma or not, i feel if you want to learn one language to get around in the world, there are many better options than esperanto. English one of them but hey, spanish would work too, if you go to south america… I also think english by now is a common treasure for humanity, and not related to one country or empire. It evolved into a simple enough language so that you can very easily pick it up to a level where you can get around in most of the world. Anyhow, i wish all the best to all ppl learning esperanto, I’ll keep on struggling with my Dutch, and then maybe spanish or turkish :)
I have stickers on it, some of them hand drawn by my daughters.