It is not technically a "learning" resource, but Storybook[0] is useful resource for developing web UI. The tutorial[1] section is very helpful. This is a learning-by-doing type of resource.
Storybook is AWESOME to build reusable components and more importantly to showcase all of their possible variants. It makes it a breeze to ensure that UI elements are consistent and to build an overview of a design system.
https://en.m.wikipedia.org/wiki/Don't_Make_Me_Think
For blogs Smashing Magazine is consistently solid.