Instead of one artificial question with several carefully-crafted answers, you could:

• Wait until a real question is posted with one of these "common, core issues"
• Post a carefully-crafted answer which addresses one issue
• Add a link to your answer, to the corresponding language-specific tag wiki as suggested in rolfl's answer.

Example of answer titles/topics for one language (C#):

• Use using to Dispose disposable local variables <-- hyperlink
• Make your class IDisposable to Dispose disposable instance data <-- hyperlink
• ... etc ...

Instead of one artificial question with several carefully-crafted answers, you could:

• Wait until a real question is posted with one of these "common, core issues"
• Post a carefully-crafted answer which addresses one issue
• Add a link to your answer, to the corresponding language-specific tag wiki, as suggested in 200_success's and rolfl's answer.

Example of answer titles/topics for one language (C#):

• Use using to Dispose disposable local variables <-- hyperlink
• Make your class IDisposable to Dispose disposable instance data <-- hyperlink
• ... etc ...

Instead of one artificial question with several carefully-crafted answers, you could:

1. First:

• Create a single "Canonical answers" post on Meta
• Make it Community Wiki
• Create a separate initially-empty answer for each language

2. Then:

• Wait until a real question is posted with one of these "common, core issues"
• Post a carefully-crafted answer which addresses one issue
• Add a link to your answer, to the corresponding language-specific meta-answer

Example of a meta CW answer for one language:

C#

• Use using to Dispose disposable local variables <-- hyperlink
• Make your class IDisposable to Dispose disposable instance data <-- hyperlink
• ... etc ...

Instead of one artificial question with several carefully-crafted answers, you could:

• Wait until a real question is posted with one of these "common, core issues"
• Post a carefully-crafted answer which addresses one issue
• Add a link to your answer, to the corresponding language-specific tag wiki as suggested in rolfl's answer.

Example of answer titles/topics for one language (C#):

• Use using to Dispose disposable local variables <-- hyperlink
• Make your class IDisposable to Dispose disposable instance data <-- hyperlink
• ... etc ...