- [career] or [careers]
- [design-pattern] or [design-patterns]
- [best-practice] or [best-practices]
Having thought on this I think it's better to have plural tags...
An example with [design-pattern] and [design-patterns].
There might be a question regarding a single design pattern,
but there might also be one regarding multiple design patterns.
Both tags fit well for the first question about a single pattern,
however [design-pattern] doesn't math for the second question about multiple design patterns.
Another reason for plural tags is that a tag lists questions about design patterns, not design pattern.
However, there are exceptions to this proposed rule: