Hey buddy!
From your question, I assume you have a little knowledge about HTML, JavaScript and jQuery. The key to be a successful web developer is to practise and read a lot.
- Follow a couple of popular web development blogs. Eg. Smashing Magazine, A List Apart
- Do small freelancing projects. Use Freelancer.
- Check out popular CodePens and try to understand how they are made.
- Stay updated with latest web development news and updates. Hashnode is one of the best places to be.
- If you want to be a frontend designer, understand the basics of CSS. Chris Coyier will help you with that through his blog CSS-Tricks
- If you like JavaScript, learn AngularJS/ReactJS and NodeJS.
- and follow some popular developers on Twitter.
Cheers! 🍻