Translation of diablito

I will usually use the most usual sense of the term, and not the more sophisticated ones and I think you will understand what I wanted to say. In any case we should review all words every two days or so.
I have began to learn English. I like to swim and to dive, because I lived near the beach while I lived in Miami. It is not similar to any other sport. But this week have not been yet to the pool.
How long have you been practicing Spanish using this site and in which lesson are you now? I am now at vocabulary lesson number 3. It is still hard for me, but I'm quite new here and need to get better.