Simple Rhythms (if the beat is the quarter note) International Names Theory Things   William Wieland
Eighth Note: = ½ beat
Quarter Note: = 1 beat
Dotted Quarter Note: = 1½ beats (a dot adds ½ the original value)
Half Note: = 2 beats
Dotted Half Note: = 3 beats(a dot adds ½ the original value)
Whole Note: 
 
= 4 beats
Rhythm Tree
Eighth Rest: =  ½ beat of rest
Quarter Rest: =  1 beat of rest
 
 
Half Rest: =  2 beats of rest (Half is a hat.)


Whole Rest: = 1 measure of rest (2 beats in 2/4 time, 3 beats in 3/4 time, 4 beats in 4/4 time, etc.)
2 eighth notes on the same beat are beamed together:   ( not  )


musictheory.net offers several excellent explanations: