Welcome Sazid! Be sure to read the global guidelines, the link is under "INFO" at the top right of the page, and also some sub-forums have additional rules which are pinned at the top of that sub-forum. Make sure your questions are well thought out and if you have sources that prompted the question, it is always a good idea to provide a link so that others can see what your question is based on. You will find many friendly, knowledgeable people here that will be glad to help.