A note refers to the name of the note you gave to this friend. For example, your classmate A, you can remember it as his nickname: Xiaobai.
Tagging means: you sort out all your WeChat friends, classmates are classified as one kind of tags, colleagues are classified as one kind of tags, and relatives are classified as one kind of tags. You can add label classification according to your own specific situation.
The function after classification is that after you send a circle of friends, you can set it not to be seen by anyone! Objects you don't want to see can be set according to your label! For example, if you send a photo and don't want to show it to the leader, you can set it not to show it to the label "Leader".
I hope my answer can help you!
thank you