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OpenStax
Open Stax: Catherine Schmidt Jones: Duration: Notes Lengths in Written Music
Read everything there is to know about the basics of notes. From their durations, their shapes and their stems, you will learn how notes are used in music.
Music Education
Learning to Read Music: Basic Counting
Apply basic knowledge of reading music by counting beats and reading notes. Here are some simple lines of music which incorporate different types of notes and patterns in common time.
Music Education
Learning to Read Music: Basic Counting, Part 2
Beginning musicians can practice reading notes and counting beats using this resource that also provides several lines of music with different types of notes, rests, and time signatures.