If you are new to SEO, then in addition to the link @Gandalf provided, I highly recommend you read Google’s “Search Engine Optimization Starter Guide”.
As mentioned above, you should look around the Marketing forum, as this question - or very similar - has been asked and answered many times. Indeed, we have a current thread on this very subject, so to avoid duplication, I’m going to close this thread and invite you to join the discussion here: