Learning a completely new thing may be hard, but not impossible. If you have the right resources and will to learn, you will come-out being a Ninja . I don’t even remember, how I learned HTML/CSS, but now this helps me in earning my daily bread-butter.
If you are looking for a completely free course for learning HTML/CSS, there is this new website called InternetingIsHard. The website has been crafted very beautifully along with clear images and clean code examples. It almost covers all the sections of HTML/CSS and more is yet to come.
Go ahead and enjoy your learning.
Website Link: https://internetingishard.com/