Linux Privilege Escalation Skills Assessment

I am struggling with finding the first flag. I looked through all the files and directories with ls -la, but did not find flag 1. Any one can point me in the right direction? What am I doing wrong?

Also, can I have a hint for flag 3? I have no idea where to find it. I read in another post that it has something to do with Barry, but I authenticated as Barry and only found flag 2.

I am struggling with Flag 1, 4 and 5. Since you have logged in with barry do a search to find files that barry or the group barry is part of can access.

Enumeration is your friend for the first 4 flags.