Have had a horrible boss

We all know that being good at your job doesn’t guarantee that you're going to be a good manager. Many of us have learned this from personal experience – while most of us have had a horrible boss at some point, how many of us have been fortunate enough to work under a truly inspiring leader who knows how to motivate and get the best out of their team? And more importantly, how do you become such a leader?

https://m.careerfaqs.com.au/news/news-and-views/top-10-management-practices-of-effective-leaders

Please explain to me the use of present perfect in "have had a horrible boss".

I always get confused by "has/have had" structure. What the meaning of "had" here if the first "has/have" is auxiliary.

Thanks