I need a tool which can check if the google will be stuck in loop which crawling my site from index page and can display results instantly.How much time does it takes for google to index my site.
Man, google doesn't go around in a loop. First of all! Secondly, Google goes as deep as it can when it comes to indexing and crawling. Eventually it will find out all of your posts. but to get it index all pages faster, you should submit a sitemap. That way you can help google. Also you can set crawl rate on webmaster tools.
Google can read more pages once that your server can serve. So don't worry google will index your site too often or too fast. The opposite should concern you, that is not coming fast enough.
I heard that there can be problem that google crawlers get stuck in loop with certain codes in <head> are and never goes to the body are which contains main content of my site.
Never bother about the frequency of google crawl as long as your codes are clean and you have enabled the crawl through robots.txt file. Submitting a sitemap will help faster indexing of your pages.
What hack do I use for wordpress so google can crawl my wordpress blogs with simple theme with no sitemap and can robots.txt file be used with wordpress?
Don't worry about Google, just focus on building a clean inner linking structure and have a sitemap that links to the most important pages/categories in your website