Somewhat unorthodox opinion, but it doesn’t matter what you choose if you’re in this for the long haul. Just pick a course, site, language, etc that motivates you. The best course in the world won’t teach you a thing if you quit after a few days. So use a site you find pretty or funny and use a language that will be useful to you.

I personally learned HTML, CSS and JavaScript from W3 Schools, and just built a site using what I was learning. The site doesn’t really handhold you, it shows you features, more like a reference guide, and I just built some nonsense with it.

And while I didn’t learn a ton from it, it taught me enough to get started and over the last decade or so I’ve just continued to learn from whatever resources I stumble across, gradually building knowledge over time. I rarely use the same educational resource twice, and now that I’m experienced I often just reference documentation directly and am very rarely doing tutorials.

For Android it looks like Android has a course you can take or you could try any number of sites like Udemy, Coursera, Edx and search for “kotlin”, a modern mobile app language that’s pretty popular.