For a beginner I would recommend digital tutors. the quality of the work itself might not be THAT high, but they do a pretty good job explaining the basics and there are videos for almost everything. For more advanced stuff there are excellent gumroad tutorials from great artists like Rafael Grasseti or Frank Tzeng for…
digitaltutors.com has very good entry/mid level tutorials and I believe they have a free trial period if your looking to learn. http://pixologic.com/zclassroom/homeroom/ is pixologic's free training site for zbrush and has some very good in depth tutorials to get you started. There is also a lot of good tutorials on…
https://vimeo.com/10941211 https://www.youtube.com/playlist?list=PL925958D31D8D30C7 these are two tutorials that i think are indispensable to any beginners