I want to know that will an online course help me in spreading the knowledge about Alcohol or Drug. There are many people especially young generation who is getting habitual of consuming alcohol and drugs. So, does any online courses can help them out?

I personally doubt it will do any good. (sorry) Young people are driven by peer pressure and it will take other people their age, in person talking with them. Even then many will not listen. For those already using it often takes serious bad events to make them decide to change.