There are a couple abilities involved:

• knowing something
• modeling a learner: understanding someone else’s current level of knowledge and the nature of their lack of knowledge such as misconceptions.
• instruction skill: having the ability to remedy the learner’s misconceptions and build upon their existing knowledge to transmit the knowledge/skill

The last two are nontrivial. You ever told someone the answer to something and they just didn’t get it? Even though it was stunningly obvious to you? The last two are why.

Anyway, to your point: a lot of times the best action is just to point someone in the right direction.