Explain Sitemaps please

I know the basics, I have html and .xml sitemap which I submit for my blog and my forum which I then submit to Google and the engines. I also have a html one for my "viewers" that can be read by humans.

Anyway once submitted to google what happens there? I have a plugin on my blog so does that keep updating to google or something?

On the forum I have topics and posts all the time so do I need to update the sitemap with google or something?

Just thought I would ask, always done the sitemap thing but wondered what happens after that and does google need a sitemap after the first one?

I normally just submit maps when I need to hurry up the reindexing or chnages to a site

 

I don't know about you isss, but if you use wordpress, I think its very simple by plugin sitemap xml
generator. All run atutomatically

 

Your current strategy is adequate and fine.