Prior to design poster, you need to plan the size, content and layout of poster. White space is essential to readability and legibility. So leave adequate white space on poster. Try to convey your message clearly through your design elements and content as well. Use effective visual image that is capable to grab the viewer’s attention. Always make sure that you have picked the correct font face, size, and color. When you use text, make sure that it should be integrated into graphics because separating the text forces your viewer to break up their attention that means you are less possible to hold it.