Here is the photo.
Yes quite fat
I am very sorry, but this is a grafted plant usually sold "as bonsai", but it has nothing to do with bonsai.
They like warmth, usually die in temperatures below 10C, in the summer they need full sun, it's easy to care, sometimes when unhappy they drop their leaves (they become yellow first).
But...
I suggest buying a real bonsai from a reputable nursery if you want to become involved with the hobby.