Palette colors

https://colorhunt.co/

https://coolors.co/

https://colors.muz.li/

https://uigradients.com/

https://www.eggradients.com/

Templates

https://www.free-css.com/

https://graygrids.com/

https://templated.co

Books

You don't know JS

Eloquent JavaScript

Learning JavaScript Design Patterns

Speaking Javascript

Graphql

https://www.howtographql.com/