How to safely shut down or force shut down LG devices

LG Optimus G LS970 LG Optimus G LS970
LG Optimus G E970 LG Optimus G E970
LG Optimus Vu II F200 LG Optimus Vu II F200
LG Optimus Vu II LG Optimus Vu II
LG Optimus L9 P769 LG Optimus L9 P769
LG Mach LS860 LG Mach LS860
LG Spectrum II 4G VS930 LG Spectrum II 4G VS930
LG Nexus 4 E960 LG Nexus 4 E960
LG Optimus L1 II E410 LG Optimus L1 II E410
LG Optimus L3 II E430 LG Optimus L3 II E430
LG Optimus L3 II Dual E435 LG Optimus L3 II Dual E435
LG Optimus L5 II E460 LG Optimus L5 II E460
LG Optimus L5 II Dual E455 LG Optimus L5 II Dual E455
LG Optimus L7 II P710 LG Optimus L7 II P710
LG Optimus L7 II Dual P715 LG Optimus L7 II Dual P715
LG Optimus G Pro E985 LG Optimus G Pro E985
LG Optimus F5 LG Optimus F5
LG Optimus F6 LG Optimus F6
LG Optimus F7 LG Optimus F7
LG Lucid2 VS870 LG Lucid2 VS870