Movable Amigurumi

Dear users, dear authors,
are there any tips and tricks for making movable amigurumi?

For movable amigurumi, there are these joint discs in various sizes that you crochet or insert between two body parts, allowing you to move the arms, legs, or head.

You can make crocheted figures slightly movable by crocheting or knitting all the body parts individually and then sewing them on separately—for example, both arms— First, use a long doll needle to sew through one arm, through the body, and out the other side (the second arm); you can sew on a button at the same time, then bring the thread back the same way and sew on another button on the other side to secure it. Do the same for the legs.
I did this once when sewing a little teddy bear, and I was able to move the arms and legs a little.

If anyone has any other tips, please share them.