Please don't start a conversation in a messenger with just a solitary "hello". When you only greet without providing any additional context, it can leave the other person waiting and feeling a bit frustrated. Instead, be proactive and include your question or request right in your first message!
Furthermore, please refrain from asking for permission to ask. Phrases like "Do you have a moment?" or "May I ask you a question?" do not contribute significantly to the conversation. While you may intend to be polite, you actually convert an asynchronous communication into a synchronous one. It is important to respect the time of the person you are corresponding with.
Share this link in "general" channel in your slack and set it as a status. Help making the world a better place!
If someone has sent you this link, please do not interpret it as rudeness, but also do not anticipate a response to a simple "Hello" message.