Need help with basic armature stuff I´m a newbie with blender and this is probably very basic stuff I´m asking, but I really can´t get my head around this. I have a snakelike mesh I would like to slither in place like a wave but having two fixed points in the start and in the end of the mesh. How should I make this?  How do I make the fixed points? Thank you!
You already have the snake mesh, create a bezier curve, bend it in edit mode so it creates the pattern in which you want to slither it. Add the Curve modifier to the snake and choose the bezier curve you just created for the modifier, play around with the axis parameters. Once you get it right just move the bezier curve up and down (or back and forth), you'll get the slither.