the diffrent coding languages all help with different things, html (hypertext markup language)is a coding language that creates how the website will be displayed,as for css (cascading style sheets)is another coding language used for the styling of a website for example, fonts and colors are changed with css. Java script the 3rd coding language allows your website to be more interactive with users all of them work perfect for what they are intended to do and have there up and downs when it comes to what contents you want to create on a certain coding language ex. changing the background colour in css is easier then in html.