It is likely that events in the world will take time to unfold or the characters will accumulate injuries requiring them to heal over a period of weeks or months. During this time, if physically able, they can train new skills to proficiency if funds and teachers/facilities are available. Examples of skills available to train during this time would be studying lore on a particular subject, practicing with a new weapon, or learning to use a new tool. The General Skill list is a good place to start, however it is not necessarily a menu to be selected from at will. This is a discussion between the GM and the players and not a free level up whenever the party takes a break.