Stars and constellations
Hercules, Serpens, Ophiuchus and Scorpius occupy a swathe of sky extending from horizon to almost overhead and are home to some of the best examples in the night sky. Messier 13 (M13) is probably the easiest to find for novice astronomers but there are loads more waiting to be observed! Globular clusters are vast balls of stars. The biggest have a million or more stars in them. M13 has a few hundred thousand.
The second oddball star is called R-Corona Borealis (it doesn’t have a more exciting name). Binoculars or a telescope are needed to see the star because it usually hovers on the border of naked eye visibility. At irregular intervals of months or years this star dramatically fades become perhaps 30 times dimmer – requiring a very big telescope to see. Astronomers think that carbon dust (soot!) builds up in the star’s atmosphere preventing light getting out and causing it to fade. On the inside of the star the radiation cannot escape and the pressure rises until the carbon dust is blown out again causing the star to return, albeit temporarily to normal brightness.
There's a finderchart for the two stars here at the Sky & Telescope website.