Here is my collection of Mock-ups, Font, Icon and Colour Libraries, Stock Images and Icons I was able to collect over the years. I use them on a daily basis and they help me make my work more efficient and fun. All of these are free or have a freemium option.
As a self-taught designer, it has always been important for me to find a good source of information. Podcasts have been a big part of my learning process. It's interesting to listen to different people's perspectives and experiences. The cool thing about podcasts is that you can listen to them when you commute, do mundane things or work on not so brain heavy tasks.