The less you know about something, the easier it is to feel like an expert. Stay suspicious of that feeling.

Early on, a subject looks small, because you cannot yet see the parts you are missing. Certainty arrives before competence and usually leaves around the time you learn enough to notice how much there is. Anyone who has gone deep into something gets more careful with their sentences, not less. Being very sure about something you picked up last week is worth a second look.

Notice the topics where you are quickest to have a firm opinion. Ask how you learned it, and whether you have heard anyone who does it full time explain the hard parts. Trading a strong opinion for a good question is not a loss.