Is the mandolin tied to the left hand or the right hand?

Anything, depending on your preference.

Datura knots have a good meaning. It represents everything goes well, harmony and love, natural luck, endless happiness and so on.

Datura flower knots are more popular among young people because they originate from concentric knots. It's Tanabata, and it's not bad to weave a mandala knot bracelet as a gift.

Also, if ordinary people wear them, they will accumulate wealth and wisdom. This is why it becomes popular and classic every year.