Character skills are divided up into six different categories: skills, spells,
weapons, languages, feats and trades. Not all classes can use the spells
category. Typing any of these as a command will show you what your character
can learn under these categories. You can train all of the skill categories
but the trades at various trainers around the kingdoms. Trades are learned
by doing a quest. In some cases, for a trainer of a general skill or spell to
talk to you, they may require you to complete a quest for them. This is more
common for the more powerful skills/spells.