How to track new posts from public VK?

Question

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I saw a Telegram bot that monitors new posts from the VK public and sends them.
How does he know that a new post has been added and is tracking, or is it done via cUrl using cron?

Answer 1

https://vk.com/dev/wall.get
Get a wall. See the last 10 posts or 100. See the date of addition, if it is more than the last remembered, add as a new post, report, save the date of the last post. After a minute, repeat (or 3 times per second you can check) if there are any posts with a date greater than your saved one.

Answer 2

https://vk.com/dev/execute
pull the wall of the public, take 1 post and see if the id has changed, if so, then "uradobavilinovypost"
(that's what I said, roughly) )

Answer 3

either use api, or parse - as you say - cron and curl. I use the second method in my notification service. you can even take a ready-made function for parsing here