Leave out small words like the, or and of unless it is part of a title or famous phrase, like to be or not to be. Searching for how long is a piece of string achieves mostly the same result as how long piece string.
Searches are case insensitive. So searching for fred, Fred and FRED will deliver the same result.
To search for an exact phrase or sequence of words, enclose it in double quotes. Searching for engaging online educational resource brings up amazon.com, whereas “engaging online educational resource” brings up something altogether different!
Lastly, to see how many pages of your website are in Google’s database, prefix your website address with ‘site:’ like this site:www.yourwebsite.com.