How changes in my website will reflect again in google search engine?

Hi, I have created a website & provided my sitemap to google. google started searching my webcontent. I have a few changes to be done for my content or need to improve my content still more. I did & posted in my webhost. My question is will Google starts seaching keywords of my new content automatically OR... show more Hi,

I have created a website & provided my sitemap to google.
google started searching my webcontent. I have a few changes to be done for my content or need to improve my content still more. I did & posted in my webhost.

My question is will Google starts seaching keywords of my new content automatically OR should I resubmit my sitemap again in webmaster
OR else what should I do for the google identify my new updated keywords & identify it search engine.

Thanks in advance,
4 answers 4