please help new to site

are these secure? normal? worried about corrupting/destroying a/v fies or back door vulnerabilities.  THANK YOU SO MUCH FOR YOUR HELP!

I found a folder before called "PHONE BOOK", I THINK THAT WAS THE NAME.



I ALSO OPENED A .TXT FILE, I BELIEVE...IT SAID "delete hidden phone book"


i think something related to auto callback dialer?



Any comments would be very much appreciated.  My baby mama is in IT SECURITY, PENETRATION TESTING, GOES TO DEFCON, ETC.

THANK YOU SO MUCH!