important urls

selenium:

seleniumtests.com
qatestingtraining.com

toolsqa.com

java tutorial:

http://www.tutorialspoint.com/listtutorials/java/collections/1

http://www.programmingsimplified.com/java/source-code/java-program-compare-strings
http://www.studytonight.com/java/string-handling-in-java

Agile;
http://agiletransformation.com/agilevideos/

webservices:
http://www.computertrainingsonline.com/soapuiwebservices-testing-interview-questions/

logs:

http://logtail.blogspot.com/2007/04/how-to-search-logs-using-grep-part-1.html


unix:
http://manuals.its.virginia.edu/unixtut/index.html

xpath tutor:
http://software-testing-tutorials-automation.blogspot.com/2013/06/xpath-tutorials-identifying-xpath-for.html

selenium interviews:

http://www.studyselenium.com/2013/12/100-selenium-interview-questions.html