Take it easy on me boys I don't know where to start but I want to learn how these work and need help.

Let me explain a lil better so you understand where im coming from. My wife and I enjoy going to estate sales now that I am retired. Well this past weekend we purchased 2 used laptops that the gentleman said he just finished taking all his family members files off. Fast forward to today I was browsing the internet and noticed the young man didn't clear everything because the bookmarks were still saved so I was curious and started going through them and then I come across a site called blockchain and it let me automatically enter in. Thats what brings me here because I have tried to get a hold of the young man but no luck. If anyone can guide me on what to do with these thinks i would appreciate it.