Welcome. Being new to the site, you need to be sure to read the "Read Me' posts at the beginning of each forum. The ones here for example recommend that you just post a general introduction here and post tech questions in the appropriate tech forum. This will give you the best chance for a good answer.
Also, this question is extremely common and has been answered in great depth many times on the board. Be sure to try the Search link in the menu at the top of the page before posting a basic question to avoid duplication.