Easing the bone's movements

Use the layer parenting tool. https://youtu.be/F6X3iCKyY6Q

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  @Hirad5F8F@Hirad5F8F wrote:
  

  Is it possible to ease in and ease out a bone's movement at the same time? I tried to do that but I could only apply one of them for each movement.

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Yes you can. After animating, click on a frame between 2 keyframes and in the Properties Panel, go to the Easing section and drill down the TYPE drop-down and select Stop and Start (Medium) or select (Fast) or (Slow) depending on your preference. The naming of eases varies across Adobe applications (After Effects refers to them as Easy Easy, etc). If you go to File > New > there's an example source FLA along the bottom (may need to scroll) with a skeleton rigged with the Bone tool. That animation uses eases and you can open it (double-click the thumbnail) and click on frames in between keyframes and look in the Easing section of the Properties Panel.

Instead of wasting time with the bones, you'd better look into SMR - a hybrid system that works well and will have pro-grade IK released very soon: