you need to start with something simple like
Objective-C: It is a programming language based on “objects.” That’s why it is known also as an object-oriented programming language or OOP. It has a Smalltalk style similar to C programming.
after that, you can go for "SQL" and "PHP"
PHP is: PHP or Hypertext Preprocessor can run on various types of databases as well as operating systems like Mac OS X, Linux, Windows, UNIX, and others.
SQL is: SQL or Structured Query Language is used to access databases. It is a tool that can change databases.
if you want to go for some hard language you can try to learn "javascript" and "C" and "C++" and "Python"
In the opinion, you need to start with simple languages to know how codding works.