Search operators and filters that help you search Google smarter:
Phrase search "... .... ....."
Search on an exact phrase, using quotation marks: "dark tourism"
Article search filetype:...
Search on a particular filetype (PDF, Doc) in combination with search terms to find articles on a particular topic: filetype:pdf tourism
Exclude terms
Use the minus character to exclude terms that often appear together, e.g. search for York -New if you want information about the city York
Filters
Filter your search result on location, language, period and/or material type
Advanced search
Instead of operators and filters, you can use the option Advanced search
Google Tips & Tricks
Tips & tricks on how to search Google efficiently
Google Search Help
Use this Google Help page to read about search operators, refinements etc
Book on Google Search Tips
55 Ways to Have Fun with Google by Philipp Lenssen