Is providing tutorial URL allowed?

Is providing tutorial URL allowed

• Would you please tell if below is allowed: When answer questions: Is it OK to provide third party site link in the bottom for user to click and see details of answer with implementation ? How many third party site URL is allowed ? Is anybody check provided URL is not spam and intimate user about it who has answer the questions ? Thanks!

• Answer:

  Yes. third party links are allowed, but only if they relate to the question. For example, if I have a question about C++ inheritance, and in an answer someone wants to reference the official documentation, then a third party link is appropriate. However, irrelevant links in answers may be flagged as spam, deleted or edited away. If I post the same question as above, and someone posts an answer that has a link to Python documentation, it may be acceptable with a thorough explanation. Of course, if you post a third party link to Prescription Drugs Now!, then your answer will be flagged as spam and it will be deleted. Your account will also suffer the repercussions of posting spam, which we take seriously here. Other users will notice the spam and you will be in hot water for it. You usually don't need to be familiar with the question to smell when something is spam. Also, do not post link-only answers. Answers should be still useful even if links go dead or become removed. You can include as many third-party links as you wish, as long as they are appropriate.