Google tricks

Search the definition of a word:  Definition: Search term

Search for related words: ~search term

Search roof words in a specific order: enclose the entire expression in quotation marks

Exclude words from the search: search term -exclusion term

Search a website: Search Keyword

Search for specific file types: filetype:PDF or intitle:index of /pdf

Search the web server for specific folders: intitle: "index of" inurl:/music