I come across a lot of really good resources throughout my day. Below is a curated-over-time (read: work in progress) list of resources.
Collaboration & Troubleshooting
- Salesforce Stackexchange
- Salesforce Discord – this is like Slack, but with voice capabilities
- Salesforce Success Community
Learning
Salesforce Design & Dev Resources
- Mockaroo – download mock records for your sandboxes/dev environments
- Salesforce Lightning Design System – Salesforce’s design framework
- Lightning Developer Library
Web Design
- Font Awesome Icons
- Material Design Icons
- CodePen – a great resource of projects you can take and customize for your own purposes
- Transfonter – @font-face online generator with great customization options