In 1999 two social psychologists called Dunning & Kruger studied people’s perception of their skills compared to their actual ability. Their initial findings showed that some people often over-estimate their ability as they don’t know enough to know they’re not that good. They then did some further work & found that highly skilled people often under-estimated their strengths; because they thought something was easy they thought everyone would find it easy & therefore discounted their own ability.
Why’s that last bit important?
Because often when we’re at work we can all lose sight of the skills we have when we just consider it “stuff that we do” - we stop realising we’re good at something just because we find it easy. Most interviewers will ask you to describe times that you’ve shown a skill so it’s important to think again about the what & the how & look harder at what makes you stand out. Are you the one the boss always asks to take on that extra task? Are you that go-to person the rest of the team turns to?
(For a quick video on the Dunning-Kruger effect, take a look at https://youtu.be/pOLmD_WVY-E )