How to make secure code for website?

Question

Creating website or other software were susceptible from hacking. How to secure our code?

Answer 1

In php, a good technique is cleaning all the input using the mysqli_real_escape_string() method before working with the database to lesson the chance of XSS attacks.

Answer 2

Also, use $_POST for all secure information transfer (such as passwords or credit card numbers)

Answer 3

which programming language? Php? Also you should know that no code is completely immune to hacking, but there are ways to make it safer

Answer 4

Yes off course . If we use framework, Someone already provided the secure code but what is the concept.? Off course that is not absolute secure there always be a methode for hack the code