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Back-end are the code which are not visible to end-user.
For PHP you can add your code directly in the <body>..(add your PHP code) ... </body>
See the tutorials of back-end in solo learn or watch tutorials of back-end on YouTube.
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install (web) server on your (desktop) machine, and backend-framework for your programming language. Soon you will need SQL database.
Install SDK for basic support of your p. language. and IDE as editor o your codes.