In response to a question that is not well-developed (one-liner, trivial because it asks for the definition of a common technical term or a comparison of common technical terms), we sometimes suggest in the comments to google it.
It takes one glance at the right sidebar to check if there are potential useful Q&As on our site itself, and these might be more helpful to the OP. If that is the case, suggesting that the OP read these posts before editing the question to improve it serves two purposes:
- It promotes our site.
- It illustrates to the OP how one might ask a well-developed question (e.g. saying what about a definition is unclear, or applying it to which example is confusing), and how you then are more likely to receive a relevant answer.
I'm not saying that StackExchange Chemistry always already has the best material - there are certainly areas of chemistry that nobody asked about before. But if material onsite is relevant to get the OP started on reading up on the topic of interest, we should point it out. This is slightly different from the situation where the OP's question is well-developed but identical or virtually identical to another question already answered on the site (in that case, you would tag the new question as duplicate).