What I must know to make a dynamic web-site?

I want make a dynamic web site , I know Html5 and CSS3 , I'm leaing PHP ( I'm leaing in CodeAcademy and I'm in 50% of course ) however , I search at google , I see some sites write : You must know JavaScript to make a dynamic web site ! but I think , I must know PHP to make a dynamic web site , any way , I make a web site nav bar , this link is my site preview :

[1]:http://codepen.io/Farzdev/pen/pbQvPa 

how can I make my site dynamic ?

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