Hi   Welcome to Wikipedia The banners that you are seeing within some articles are templates They are created in order to be used AKA substituted or transcluded in many other places without the need to create the same template each and every time To view a list of Template Messages that are available to be used just visit WikipediaTemplate messages Make sure that you read the documentation and understand the proper usage of the template before you include it within an article Being bold is absolutely encouraged here  but if someone removes your change and messages you stating that your edit wasnt correct make sure to learn from this and take the legitimate advice left by others Please do not hesitate to message me again as you already did if you have any more questions Ill be happy to answer them and provide you with all of the help that you need Again welcome to Wikipedia I hope that you enjoy your stay and become a longterm contributor here