FerFal make lot of sense ,and he is talking from his own experience, he is been there, so lot of good points.
But important thing is that there are levels of SHTF, and SHTF that he went trough (economic collapse of his country) is different from full scale collapse (that I went trough) so advices are different.

When real SHTF I am gonna go home from my job, I am gonna say “forget it” to everything, and go home to take care for my family. Police gonna do same, and everyone else. It is full scale. There is no law to protect you in the city, it is quite opposite, you are gonna be safer far from the town.