<p>This will grow over time as I get more recommendations from trusted sources.</p>
<h1>Next</h1>
<ul>
<li><a href="https://nextjs.org/">Nextjs</a></li>
</ul>
<h1>Responsive Web Design</h1>
<p>Paid:</p>
<ul>
<li><a href="https://www.awwwards.com/7-essential-books-on-responsive-web-design-you-do-not-want-to-miss.html">7 Essential Books on Responsive Web Design You Do Not Want to Miss</a></li>
<li><a href="https://www.amazon.com/Practical-Web-Inclusion-Accessibility-Comprehensive/dp/1484254511">Practical Web Inclusion and Accessibility: A Comprehensive Guide to Access Needs</a></li>
<li><a href="https://www.freecodecamp.org/learn/responsive-web-design/">Responsive Web Design</a></li>
</ul>
<p>Free:</p>
<ul>
<li><a href="https://www.youtube.com/watch?v=p0bGHP-PXD4">Build a responsive website</a></li>
</ul>
<h1>CSS / SASS</h1>
<p>Paid:</p>
<ul>
<li><a href="https://www.leveluptutorials.com/tutorials/modern-css-design-systems">Modern CSS Design Systems</a></li>
<li><a href="https://www.leveluptutorials.com/tutorials/modern-css-layouts">Modern CSS Layouts</a></li>
</ul>
<p>Free:</p>
<ul>
<li><a href="https://sass-lang.com/guide">Official SASS Guide</a></li>
</ul>


A list of useful references for leveling up frontend development skills.

Daniel Roy Greenfeld

Frontend Dev Resources

Next

Responsive Web Design

CSS / SASS