If you want to take this practice further, below are some vetted resources that we recommend.
There's an endless supply of books, many focused on just the technical aspects of sketching. Below are a few that I recommend that bring the practice to application.
The Noun Project - if you're struggling to visualize a concept, start with the noun library and search for your term.
Sketchnote Army - this is a great community by Mike Rohde.
Storytelling skills for all. A Nineteen80.co production.