I can't quite tell if you're having trouble with front-end architecture (code structure/design, separating things effectively across HTML/CSS/JS) or design (UI,

I can't quite tell if you're having trouble with front-end architecture (code structure/design, separating things effectively across HTML/CSS/JS) or design (UI, UX, look/feel, application layout and navigation structure) or both. If the first is the problem, it's probably worth running through some tutorials to build a full application on whatever set of libs/framework you've chosen. For example, there's a course on Udemy called "Modern React and Redux" that'll introduce you to (surprise) react and redux, as well as demonstrating how to structure your application and build some basics. There's any number of similar things from other people for other ways to structure an app with jQuery or Angular or whatever. If the design-side stuff is the problem, the first and easiest thing to do is look at examples of good design. Showcases like https://www.thebestdesigns.com/ https://www.thebestdesigns.com/ will have tons of beautiful, well-designed websites you can look through and examine. This is more useful if you put some effort into it (What do I like about this design? Why did they do things this way? If I play with the CSS and adjust these things, how does that change the look/feel? How did they get this effect?) Sites like https://alistapart.com/ https://alistapart.com/ and Smashing magazine will have some useful articles to read, sites that sell templates can give an idea of current design trends that are popular/sell well (themeforest etc.), Dribbble and the like will have detailed design mocks, UI kits and guidelines will have basic layouts for UI elements. It's probably worth spending time wire framing with tools like Balsamiq/Sketch/Photoshop, though if you've never used any of those I'd go with pen and paper. If you're doing both the coding and design parts of the process, its probably best to separate them. If your design isn't well defined when you start coding, it's easy to discard important aspects of it in favor of code efficiency. Similarly, it's usually better to get the look of things right in your design tool instead of spending hours tweaking shadows and colors in CSS.