I’ve dabbled with SoloLearn as a smartphone app, but it’s available across devices (https://www.sololearn.com/). I’m not fluent in any code language, but I greatly enjoyed their lessons in HTML, CSS, and JavaScript especially. The chapters are short and offer intriguing, applicable, and skill-building morsels about code languages. I encourage you to check it out. You will need a login, but I it’s free and I find it to be pleasant to use.
Thanks @SoloLearn for making this resource available to all. Shout out to Mango Languages; if you haven’t heard of them, then ask your local library staff!
#LifelongLearning