If my site does not cached by Google regularly; then what should I do for this and also tell me that is it necessary for a particular site that it will cached by search engine regularly ???
Google indexes every website with different frequency. Domain authority, how frequently is the content updated, No of backlinks for your website are some of the factors that decide the caching frequency of a website. I would suggest you to update fresh and relevant content on a regular basis, also do some link building, make your content available to Google bot from various sources. Keep doing this and it will cache it surely. Hope this helps.