How can I improve my php code ?

I have learned php programming language all by myself and now I can make a data site with a database and a regular code format and I want to know a lot about how I can improve my coding by make it oop and to improve my security to upgrade my skills to make an application that has a lot of data that can’t be known by any other one and how to store my data in the database with coding , please advise me where to go to improve these skills .

Source: oop

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