What Course To Take?

I want to learn web design and app development, I’ve learned HTML,CSS(little),Javascript

which course should I take?

make a website:


after that, seems there is no more free courses for web design, so you could learn from the bootstrap documentation, sololearn and freecodecamp

app development is very broad term these days, android app? ios app? web app? So many options, and so many languages available for it