reference-request tag is missing [duplicate]

Question

Why there is no reference-request tag?

I want to ask where can I read about a certain topic.

Are questions like this offtopic?

Answer 1

Reference requests are off topic. From our "What topics can I ask about here?" help article:

Some questions, even if they appear to fit into one of the above categories, may still be off-topic or a poor fit for this format:

• explaining, writing or debugging code
• providing support for tools or products
• finding or recommending products or services, including tools, libraries or packages, programming languages, books, scholarly papers, tutorials, articles, or blogs
• career or education advice
• legal advice or aid

Answer 2

The Help Center specifically defines this type of question as off-topic:

Some questions, even if they appear to fit into one of the above categories, may still be off-topic or a poor fit for this format:

...

finding or recommending products or services, including tools, libraries or packages, programming languages, books, scholarly papers, tutorials, articles, or blogs