Find here the 15 brightest star clusters you can see without any special equipment. Observing deep-sky objects is easier than you think!
Star Clusters Names, Globular Cluster vs Open Cluster
What is the difference between a globular star cluster and an open star cluster?
Interpreting the HR diagram of stellar clusters
Open Clusters by the Season - Sky & Telescope - Sky & Telescope
Types of Star Clusters
Hubble dispels dust to see a glittering globular cluster
What are the motions of stars relative to each other in a globular or open cluster? Does the cluster move as a unit over time?
Open Cluster Messier Objects
Open (Galactic) Star Clusters
Observe the Open Clusters of Autumn - Astronomical Society of Edinburgh