How to select what tag should be "primary" for the question?
99127
What is a question page's title made up of?
5671
What does ON [PRIMARY] mean?
119437
What are the guidelines for using version-specific tags?
107498
Answering tag questions
128981
Searching for question having strictly a certain set of tag
21182
Is it okay to add id/class to  tag?
14769
Which tag is added to the page title?
109571
Multiple tags for 'Favorite tags'
28224
Are the tags shown in a particular order?
19871
How are "Suggested Tags" chosen?
98376
Mark my own question as favorite?
156434
Tagging multiple questions at the same time?
48663
Possible Tags similar to "Related Questions" under Title
103211
Vote for Tag Synonyms Directly on the Page
100090
Why don't we add a question with the same tag on multiple Stack Exchange sites?
157189
Tag question of negative form
106826
Putting things in  tags allows one to get outside the question border