The question of how and where to learn HTML & CSS is a highly reasonable thing to ask. The answer depends on all sorts of things: how serious you are, your current foundation, what other resources are available to you, what you hope to do with what you learn, and how much time you have, among probably a zillion other things.
Let’s look at a bunch of options and you can choose the ones that feel right to you.
You could read a book.
There are a ton of books out there that cover HTML and CSS (and often together). They probably all do a fine job. There’s no need to chronicle all the choices here. These two are my personal recommendations. You probably don’t even need both.
You could read through all the posts in our Beginner’s Guide.
We have a guide (a collection of articles, videos, and links) called Just Starting Out with CSS & HTML. I hope there is stuff in there that can help kickstart or augment your early learning because that’s the intent.
You could find and take a paid online course.
I often join gyms because the accountability of paying for something gets me to do it. I know I can do situps, pushups, and go for a jog for free, but the gym membership makes a thing of it. Well, same could be said about paying for a course on HTML and CSS.
These are broad generalizations, but good places to start:
You could go to an in-person code school or coding bootcamp
If you wanna put even more skin in the game, you could consider literally going to school. If you don’t have a college degree, that’s an option, although you’ll be looking at a broad education rather than a ticket to leveling up your web design and development skills alone. I’m a fan of that just for the general mind-broadening it involves.
But assuming you’re going to go to a coding-specific school…
There are probably dozens — if not hundreds — more, so this is more to inform you of the possibility of schooling. You don’t even have to go to a physical school since plenty of these offer online courses, too (but with the advantage of live instruction and cohorts). For example, LambdaSchool has the novelty of being free to start and paid later in the form of letting them take a portion of your salary after you get a job in the industry.
You could practice on CodePen.
Not every second of your learning should be strictly following some course laid out by a book, class, or teacher. It wouldn’t even be that way if you tried. You might as well embrace that. If something tickles your muse, go play!
I hope CodePen is a rewarding place to do that, making it both easy and useful, while providing a place to connect with other folks in the field.
You could build a personal site and learn what you need to get it done.
That’s how absolutely countless developers have cut their teeth, including me. I wanted a personal website years ago, and I struggled through getting a self-hosted WordPress site online so I could have full control over everything and bend it to my will. Once you have an actual website online, and you know at least some people are seeing it, it gives you all the motivation in the world to keep going and evolve further.
Equally as common: build a website for your band. Or a friend, friend-of-a-friend, or the business of your mother’s business partner’s sister. When you have a real project (a real website on the live internet) you have that feet-in-the-fire feeling that you’re responsible for something real that real people are going to see and you have to get it done and do a good job. That works tremendously well for some people.
You will actually learn by doing a combination of all this stuff.
People are obsessed with asking musicians if they’re “self-taught”. Like, if they are, their amazingness triples because it means their creative genius was delivered by a lightning bolt at birth. They don’t need anyone else to learn; they merely look at those guitar strings or piano keys and know what to do.
And if they were taught by a teacher, then, well, that’s all out the door. If they are good at all, then it’s because the teacher delivered that to them.
People learn anything — music and web development included — inside a hurricane of influences. Let’s stick with music for a second. Learning to play comes in many forms. You learn by listening to music an awful lot. You can do fundamental practice, like finger exercises and going up and down scales. You can learn to transpose chords on a chalkboard. You can watch YouTube all day and night. You can sign up for online courses. You can go to local jams to watch and play along. You can join a band. You can take lessons from someone advertising on Craigslist. You can go to a local music school. You can read books about music.
You get the idea.
You can and will do all of that. With learning web design and development, getting anywhere will involve all sorts of ways. There’s no silver bullet. It takes bashing on it lots of different ways. There’s no requirement to sprinkle money on it, but you do need multiple angles, time, and motivation.