turn out a light > X Its either turn on or off the light
put out the light / put out the campfire > ok
turn off a light > ok > turn the switch off
go off = blow up= to explode >the heat caused the bomb to go off/blow up/explode. ( go off here means it exploded)
But , go off is used only for things like gun , bombs or similar things that are inclined to cause an explosion / or to fire
You cant say " the tanker went off , but you can say " the tanker exploded/blew up"
The gun went off accidentally ( here it means it fired)
put off / delay / postpone = quite similar in meaning ,but there are differenes in usage
to put off > to do something at a later time . Could you put the meeting off till next year ? > here youasked him to change the time)
to delay > to make something done not fast . Could you delay the meeting till next year? > here you are asking him to " slow down" the approach of the meeting
Postpone > to change the date of something to a later date to replace the one that is scheduled > Could you postpone the meeting because the date set next week is not suitable for me ? > here you replace a set date with a later date