In depth tutorials
https://www.youtube.com/channel/UCWv7vMbMWH4-V0ZXdmDpPBA
All kinds of web dev videos
https://www.youtube.com/channel/UCFbNIlppjAuEX4znoulh0Cw
Short videos, good for introduction to topics and overviews
https://www.youtube.com/channel/UCsBjURrPoezykLs9EqgamOA
Frontend and UI/UX
https://www.youtube.com/channel/UCVyRiMvfUNMA1UPlDPzG5Ow
Frontend
https://www.youtube.com/channel/UCJZv4d5rbIKd4QHMPkcABCw
Free courses on almost anything
https://www.youtube.com/channel/UC8butISFwT-Wl7EV0hUK0BQ
Design Inspiration
http://behance.net/
Design Inspiration
http://pinterest.com/
https://www.creativebloq.com/graphic-design/what-flat-design-3132112
https://neumorphism.io/#e0e0e0