I use to use "post lunch" to inform a person about fixing up the meeting time if it is in the afternoon office time. apart from that I have never used it in any of other conversation.
recently, In British council website I read the following sentence " You will also have a chance to interact with our expert teacher who will help you identify your English learning requirements, post this you can enrol for a course that suits your requirement."
In the above sentence post is used. If the same information, if I would have written, I would have used "After". since the above sentence is from British council, definitely they are right.
My question now is, Can I interchangeably use after and post? or is Post and after has got a different meaning and should be used appropriately? if so, How can I trigger myself choosing the right word?