# Is it okay to give a link to video lecture as reference source?

Are questions like this allowed? It seems mentioning video link in a question post is against rules but I never get to read code of conduct until now. I explain everything in my question post and give link in the end to the lecture as these lectures are popular but still I received warning three times by the same user on linking video. Is this a bad practice?

• – Qmechanic Dec 1 '19 at 3:52
• @Qmechanic that post is very helpful. Thank you:) – pooja Dec 1 '19 at 3:57

In this case, he's right: you're requiring us to watch a video to understand what is being explained by Prof Lewin that you are questioning--you really don't describe anything in the post itself (i.e., what is $$T_1$$, $$T_2$$? What rope? What cylinder?), it's all in the video you link.