Without more information about what you want to learn and what your objectives are, it's hard to recommend specific sites. Do you have any idea what language you're aiming to take up, and have you got a specific project in mind?

Here are some basic guidelines if you're just looking to get involved:

• Before just diving in, work out what you want to achieve. Sometimes it's easier to take an existing project and work on adding features than starting from scratch. Identifying your area of interest will help narrow the selection of languages you'll want to focus on.
• Start small. Don't take on big projects until you're comfortable achieving tasks you set yourself. Running code on a webserver is a good way to start seeing immediate results. Choose a language that suits, and hack something together. Javascript, html and css are a good entry into coding, and the results are immediate, no compilation required, just a webserver and and browser!
• Find a text editor that you're prepared to invest time learning. VS Code / Codium might appear daunting at first, but if you're committed to learning, it'll pay off in time by helping you write and format your code with inline help, syntax highlighting, autocomplete, and error checking etc. For something simpler but still coder-focused, Bluefish is a lot less capable but a lot easier to pick up, and still has syntax highlighting and support for various languages.

• http://w3schools.i2p/php/default.asp
• https://www.geeksforgeeks.org/php-tutorial/
• https://www.phptutorial.net/

A famous super hacker recommends Lisp. See "Programming languages" and "How to learn programming" section.