When to Tag
There is an arbitrary threshold on when a note should have a certain tag. The measurement that’s used against this threshold is Tag Power. A tag is considered powerful enough to be added when the note related, either trivially and directly, to this tag.
Say for example we have relatedness A~B~C~D.
D usually should only be tagged with C.
B should can have tags A and C.
This is similar to how one may link notes.
Expansion on Related Tags
#scrum is a direct descendant of #agile (#agile $\leftarrow$ #scrum). A note based on scrum is trivially related to #scrum, should also have #agile.
However, a note based on agile will have #agile, but should not have #scrum.
The only exception is when a note is dedicated to talking of both topics on equal footing. #gamedev and #photograpgy are not immediately trivially related, but the exception allows it such that for both tags under the context of Photography and Texture Mapping to Character Models.
Tags should not be used to show relatedness between notes.
Source LDP/600 Resources/Note Tags