Help: Forgetting

If at any point you wish to go a different route with your skills,
you may choose to FORGET them so that you may pursue another instead.

Should you proceed, you will completely erase any knowledge you have
of the specified skill. You will be refunded a skill point in the
corresponding category, as well as a portion of lessons dependent upon
the level of your skill.

Do note: basic skills are permanently engrained in your memory and
cannot be forgotten.