Circle of 5ths (click to enlarge)
Make a circle of 5ths spinner (click image to download). See this video to go with it.
The 6 common chords in each key (GCEA tuning)
The 6 common chords in each key (Baritone DGBE tuning)
Fingerboard Chart- handy for use alongside https://youtu.be/p3c5Gjb-URs (click to download pdf)
And here's a version for baritone uke (click to download pdf)
A chart for the Bo Diddley Rhythm (as taught in the video below). Pdf file, click here to download.