All languages have dialects, but there tend to be "major" dialects (e.g. For English, Canadian/American, a few of the British accents could be considered as the main dialects to consider learning ...
I've noticed that there aren't any words in Spanish that start with sp. Latin words are altered to include an e in front of the sp. Even loan words are often modified to esp...: spaghetti => ...
It seems that some people pronounce words that end with -n almost as a "ng" sound. "Bien", for example, seems to come out as "Bie[ng]". Is this a regional issue? What regions use this ...