Could someone explain these recommendations more in-depth? (5) Manage Resources Symmetrically (10) Let the Code Make the Decisions What does it look like when

Could someone explain these recommendations more in-depth? (5) Manage Resources Symmetrically (10) Let the Code Make the Decisions What does it look like when you do the opposite of these rules? I think I'm unfamiliar with the problems these slides address, so I can't grasp the insight in them.