I came across a very good eBook titled “99 Things You Can Do to Become a Better Tester” and I believe it’s worth your time to read it. The eBook is a collection of ideas and comments consolidated in an forum post of Software Testing Club.
The eBook listed out 99 things and I would like to add one more thing. It’s about learning how to ask good question.
Anyway, you can download the eBook use this link: http://www.ministryoftesting.com/wp-content/uploads/2013/07/99ThingsEbook.pdf