I have been using iClone for many years to produce small animations for my personal use and I am definitely not an expert.

Actually I am making animations by myself and I take more care of the details, and I face this problem using the Edit Motion Layer: in some circumstances that I don't identify, if I place, let's say, a foot in a specific position, as soon as I release the mouse button, the limb moves and positions itself in a different way.
The overall position of the character is absolutely natural and there are no constraints applyed. It is useless to try to pin some body parts as the character never stays in the desired position.

I realize that I don't have complete control on how to use the animation tools and there is something I don't know.

If I look at the animation tutorials everything seems easy and fluid, but I often (not always) experience this anomalous behavior using Edit Motion layer.

Is there a very complete documentation, or something that I can study, that contains EVERYTHING you need to know about the tools, the timeline and its symbols, in order to take total and full control over what I try to do?

Thank you