Trial and error works to a point, but should not be used in every situation and to learn everything. There is a point where its good to know the best ways to go about things, or how different things work. The issue is, though there are some very skilled artists, they have only so much time, and can only devote so much time to helping others and the forums. Compiling all the information and tutorials would be a huge job. If it could be done easily it would already be done. The issue is that everyone has their own life, and also wishes to create art on the side.
My advice is to go out and figure things out on your own. Yes, it may take a little time to figure out how to do something, but as others said, there are tons of resources already out there, you just have to search and find them. For example, as stated before, most tutorials from other programs can be translated to Anim8or. The main thing you want to learn when following a tutorial is the methods, reasoning and techniques used. When following a tutorial to create a sword you shouldn't be following the tutorial to create a sword many other people have created. The point is to learn the techniques. Think about why things that are being done are being done, attempt to follow the logic. Take your own time to read up on different subjects and how different people do different things. Experiment yourself with the tools once you figure out how they're used, but think outside the box as well, that's now new and better techniques are created.
And yes, as xalener said, the search function should be useful to you as well.
My final note, and one of the most important things I find, is that one of the greatest ways to learn is to observe other artists methods and understand why they do what they do then you can figure out how you will work and why.
