1. [sb]#site :Using this operator you can get specific site or specific domain or subdomain
EX:
Tendulkar site:cricinfo.com- you can get result only from cricinfo and show the result page of Tendulkar from the sub domain.
Evolution site:edu- You can find the page only education related site and relevant to evolution.

2. #filetype :By using this operator you can get only file type page like PDF, PPT etc.

EX:
Web design filetype:PPT- This result show only the powerpoint slide about web design
web design filetype:PDF-This result show only the PDF file only about web design.

Google is well known and widely used by large number of online users. So, Google helps to obtain good amount of user to search their queries to find the suitable site. We have to follow all rules and regulations of Google to improve ranking in search results. Which means we need to make Google friendly sites in terms of unique content, easy navigation and keyword density. We also need to build quality backlinks for niche sites.

Yes you have suggested good ideas to better use google. We can also use "..." to get more precise results.

Your info of using Google is so much beautiful and i always use according this situation.

Yes all tips is so helpful for better search result. By using such tips we get result more quickly.