Here are some of the links that I use.

Personal:  
GitHub My GitHub
YouTube My YouTube
   
Graphics:  
Teachable Machine Make simple AR 
Quick draw Let the computer guess the drawing
   
Buying:  
www.ebay.com  
www.banggood.com
www.aliexpress.com My favorite place to buy stuff
   
Electronics:  
www.jlcpcb.com  PCB fabrication