If I add/modify some sections of one particular web page, should I also modify the lastmod and changefreq of that page URL in the Sitemap file? Will Google take a note of that change and crawl the same web page again for any possible changes? If we use a Sitemap generator plugin for Wordpress blogs, does it automatically update the lastmod time in sitemap xml file if we modify any post in the blog?
Sitemaps of a particular website helps google crawl important link all at a time. Check out the site map of my website: EcoIndia. You will find important links related to Ecotourism in India
sure ! Google can note that. if you update your sitemaps, Google will re-crawl the site and note your change.