Welcome Bob! Are you talking about learning to read tab or standard notation? If you are referencing tab, check out this lesson: https://rockclass101.com/how-to-read-tabs-chord-graphs-and-chart-symbols/.
If you are wanting to understand rhythmic notation, check out this lesson: https://rockclass101.com/understanding-rhythmic-notation-ukulele/. In the future, I plan to add a course on learning to read standard notation.
Cheers,
Andrew