These sites are tools you can use to see further examples on how to pin-point the web elements or groups of web elements you need to target. I hope you enjoy!
XPath Cheat Sheet on GitHub:
https://gist.github.com/LeCoupa/8c305ec8c713aad07b14
XPath Examples (MSDN):
https://msdn.microsoft.com/en-us/library/ms256086(v=vs.110).aspx
XPath Functions list (Mozilla) These aren’t very descriptive and don’t have examples, so not my favorite resource:
https://developer.mozilla.org/en-US/docs/Web/XPath/Functions