One of the best techniques I've taken and used in my practice, both in my design and artistic work, has got to be keeping an up-to-date self syllabus. A self syllabus is a tool that can either be digital or analogue, and is used to track, record, and manage the influences you're taking in.
Self syllabuses can be used as a method to encourage self learning.
Keeping a self syllabus can look analogue or digital using tools like Google Drive. I have found that digital tools like Google Drive have allowed me to share my log with anyone, anywhere, anytime. Although, I've struggled with the ability to feel motivated to post/update due to high amounts of time spent behind a screen.
Feeling inspired to try one for yourself? Here is a link to mine, feel free to take it and run with it while building your own! I also found this article helpful when deciding how to start and where.