Lg g4 android 6.0. not rooted

[AC Question]

After putting in samsung microsd card was checking with my oi file manager to be sure it had been detected when i noticed that when i moved imto the home directory it was showing system files that it had not previously shown. Such as dev, etc, kernel, sys, sbin and root
I've been smart (scared) enough not to touch anything but just wondered. The phone is neither unlocked or rooted.

 

[anon(632115)]

Yes, it is normal to see those files, using a filemanager