I am learning php from the internet on codeacademy.com. I have also learned html and css but the problem that i dont know how can i build a complete website then !
I study everything on its side. But how to put all my knowledge together its very hard! like when should i use this php code? When should i use the html code? So that i can make a full website.
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like when should i use this php code? and when i should use that html code etc.
You would need first to understand the concept of server-side technology(C#, java, Php, et..) and client-side technology (HTML, CSS, JS, etc..). The good source of learning is starting with a good book of web-development. Jumping from one video tutorial to another will not help.
Basic terminology on web development could be found here,
and a related SE discussion on thus terminology could be found here.
Here is a good SE question and discussion on this topic.
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HTML is used for semantically formatting (structuring) the data that you get from PHP (or any other such backend…), to put it very simply. CSS is used to change how the HTML looks. JS can be used to do special graphical effects or simple data processing (remove things after clicking, and so on) with the HTML.