What should I learn first as a beginner? Html, javascript,python, php..

At first, you have to define your aim and sphere you want to work on. Is it a web development, object-oriented programming or something else. Because you can't handle all of the courses simultaneously. If you are interested in building websites, start with learning HTML and CSS. If you want to create programs, I suggest you starting from C++, and then moving into JAVA, Python, etc.

I assume you're wanting to focus on web design/development. This is the order I'd do it: HTML, CSS, JavaScript, jQuery, PHP, SQL, NodeJS, Angular, React, Python, Java, etc... As you go along, you'll discover frameworks and other stuff that you can utilize. So just be open to learn more and to use things that compliment whatever you're trying to do. My best advice is to learn and focus on whatever is going to best compliment what you're doing at the moment.