Feel free to try out the sites and give feedback about your experience.
Stackoverflow is jut a really great source for every programmer! You can ask questions about a problem and can help others by their problems. On this website is a great community for nearly every programming language. So you can find a lot of solutions for something you want to accomplish in your project. Try it out by just googling your problem and Stackoverflow behind this. You will find something I guarantee it!
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I really love W3school!
Sounds a bit stupid but YouTube can really help you. For some problems a video can be more helpful than just text or code. YouTube is a great source for beginners. You can find a beginner tutorial to every programming language and a lot of further tutorials to really complex themes. Just try it out when you have no clue how to solve a certain problem.
This website is a specific one for germans. Here you have a really good documentation for the basic HTML knowledge. I can highly recommend this website to everyone who wants to learn HTML and is not the best in reading and understanding english.
Here you have some more advanced knowledge about HTML. This source is great for learning something new but finding something to a specific theme you need to know now is not that easy. It’s a good idea to use this website as a web development beginner.
CSS-Tricks is great for learning tricks with CSS obviously. You will need CSS to make your HTML website look great and this is a good source to learn some specific CSS things.
Also very important for a good website are very good pictures. I made an overview of websites I use to get free images for commercial use here. Check it out if you are interested.