There are some very great tutorials on the web that can help you better yourself as a music producer. However, not all these sources are credible. Nevertheless, have no fear. I searched the web and found a list of credible videos that can help you shine on the technical side of producing. Even so, when viewing the tutorials, note that you do not have to have the same Digital Audio Workstation (DAW) to understand the material the producer is presenting. The techniques, plugins and effects are, for the most part, the same. All you have to do is: (1) Observe the tutorials, (2) then transfer what you have learned to your Digital Audio Workstation (DAW).
Now, here are some links to great tutorials that may help you improve your mixing and mastering skills:
This blog post will be updated when more quality tutorials are available. Comment below other useful mixing and mastering tips or links to videos that you think will be helpful.