This is an attempt to make a list relevant for a young secondary school student.
In my opinion JavaScript is the best choice for a first programming language for a student to learn. This is because JavaScript has all the core programming features that a student would want to learn, with the ability to present the result visually within a web page.
It's frustrating that links seem always to be paid courses!
Ugly not sure about this one... kidscanjavascript.com
The initial free course is worth looking at although will have to enter card details. juni
The quality of the Udemy courses are varied, but some are really excellent and they are usually available at a large discount.
Modern JavaScript From The Beginning
Hosting is a right pain, it is possible to use Github pages for free. Would take a little set up time though. Also, using Github is great way to keep code projects.
Using a real JavaScript for Kids: A Playful Introduction to Programming
MDN is open source and provides the best reference for JavaScript language features. - See: JavaScript Guide)
Learn Plain JavaScript from Top Articles for the Past Year
Might be worth looking at: How My 10-Year-Old Learned Javascript
Code sand boxes allow learners to use various programming languages within a working web page, so they can get up and running very quickly.