Hey there! Yes, the game is totally meant to be open-ended and interpreted in a way that you feel is appropriate and useful. I've purposefully chosen to lean more toward the design and aesthetic than specific mechanics or rules.
- By "Execute", I mean "perform an action" or "do a thing". When your character tries to do something and there are unknowns about how the situation would play out, roll 3d6 to see how poorly or perfectly the attempt was. These ranges are purposefully vague to allow for open-ended and reasonable on-the-fly decision making.
- The magic table is a free-form spell creator. When casting a spell, roll 2d6 to determine the action and object of the spell. For example, you may roll "Summon/Create" and "Mind/Senses", which you could interpret as "I gain the magical ability to sense the presence of trolls." Everything else is left up to you to determine how, when, and all that stuff occurs with magic. Do spells come from wands? scrolls? innate abilities? how successful are they? does it do damage? or heal? All of this is for you to play with and do what you want with.