Google.com is the largest and most popular search engine on the internet. Google receives several hundred million queries each day through its various services. It was one of the first search engines to help lift the veil on the search index and allow users to interrogate the index via other means than just simple keyword searches. Google not only indexes and caches HTML files but also 13 other file types, which include PDF, Word documents, Excel spreadsheets, Flash SWF, plain text files, among others. Except in the case of text and SWF files, the cached version is a conversion to HTML, allowing those without the corresponding viewer application to read the file.
Here are ten tips that will help you to search effectively on Google.

1. Choose the right search terms so as to get the relevant information. If you want to search Bhopal then try ”bhopal”. But it’s often advisable to use multiple search terms; if you’re planning a Bhopal vacation, you’ll do better with vacation Bhopal than with either vacation or Bhopal by themselves. Spell carefully, and consider alternate spellings.
2. Google searches are NOT case sensitive. All letters, regardless of how you type them, will be understood as lower case.
3. By default, Google only returns pages that include all of your search terms. There is no need to include “and” between terms. To restrict a search further, just include more terms.
4. Google ignores common words and characters such as “where” and “how”, as well as certain single digits and single letters, because they tend to slow down your search without improving the results. Google will indicate if a common word has been excluded by displaying details on the results page below the search box.
   If a common word is essential to getting the results you want, you can include it by putting a “+” sign in front of it. (Be sure to include a space before the “+” sign.)
   Another method for doing this is conducting a phrase search, which simply means putting quotation marks around two or more words. Common words in a phrase search (e.g., “where are you”) are included in the search.
   For example, to search for Star Wars, Episode I, use:Star Wars Episode +I or “Star Wars Episode I”
5. Google uses stemming technology. Thus, when appropriate, it will search not only for your search terms, but also for words that are similar to some or all of those terms. If you search for pet lemur dietary needs, Google will also search for pet lemur diet needs, and other related variations of your terms. Any variants of your terms that were searched for will be highlighted in the snippet of text accompanying each result.
6. Sometimes you’ll only want results that include an exact phrase. In this case, simply put quotation marks around your search terms. Ex. to search IIT Delhi type “iit delhi” in search box and then enter.
7. If your search term has more than one meaning (bass, for example, could refer to fishing or music) you can focus your search by putting a minus sign (”-”) in front of words related to the meaning you want to avoid.
   For example, here’s how you’d find pages about bass-heavy lakes, but not bass-heavy music.
8. After you’ve entered your search terms, you might want to try the “I’m Feeling Lucky” button, which takes you straight to the most relevant website that Google found for your query. You won’t see the search results page at all, but if you did, the “I’m Feeling Lucky” site would be listed on top.
9. To find a particular filetype, you can get google to return specific file types as the results e.g. filetype:mpg only returns movie files. Most common filetypes like .doc, txt, mpg, mp3, ppt, pdf and many more are supported
10. If a site doesn’t have a local search engine you can use google to restrict all the results of a search to just a single website of interest. For example you want to search “internet” in my site abhisays.com for this enter “internet site:abhisays.com” without quotes in search box and then enter.

References:: Google.com