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For reference, [this is the list of tags we have from SE](https://codegolf.stackexchange.com/tags) which is 9 pages long, so I'll take the liberty of listing out which ones are "required" tags, as they are used to signify a scoring criterion:

- code-golf
- code-challenge
- popularity-contest
- tips
- fastest-code
- cops-and-robbers
- showcase
- optimization
- code-generation
- atomic-code-golf
- fastest-algorithm
- metagolf
- restricted-source
- answer-chaining
- restricted-complexity
- restricted-time
- code-bowling
- rosetta-stone
- word-puzzle
- optimized-output
- fewest-operations
- halting-problem
- reverse-engineering
- king-of-the-hill

some of these can be merged, and most questions will fall into 6 of these types.

Do tell me if I missed anything.