What to do first?

HTML

Html would be a great start to your coding adventure.

HTML stands for HyperText Markup Language. A markup language uses tags to identify content. It would be a good start.

CSS

CSS stands for Cascading Style Sheets. CSS and HTML work like brother and sister: HTML sorts out the page structure.

CSS defines how HTML elements are displayed.

It is better to learn HTML before CSS in my opinion.

JAVA

From Sololearn: Java is a high level, modern programming language designed in the early 1990s by Sun Microsystems, and currently owned by Oracle. Java is Platform Independent, which means that you only need to write the program once to be able to run it on a number of different platforms! Java is portable, robust, and dynamic, with the ability to fit the needs of virtually any type of application. I would wait to do JAVA until you've been coding for awhile.

JS

From Sololearn: JavaScript is one of the most popular programming languages on earth and is used to add interactivity to webpages, process data, as well as create various applications (mobile apps, desktop apps, games, and more)

Here is a start to your coding adventure. Good lick and happy coding!