Declination and Right Ascension are the two coordinates in the equatorial system similar to latitude and longitude. Declination of an object is its angular distance north or south of the celestial equator measured in Degrees. Measured in Hours, min, sec. Seen from equator, CEQ passes directly overhead. NCP is on north horizon, SCP on south.
All stars rise and set.
Seen from intermediate latitudes, say latitude L, stars within L degrees of NCP always visible. More complex-appearing planetary motion . Here are some web pages where you can find some illustrations of the concepts introduced in this lecture. Type in either coordinates or the name of an object and see a picture of that region of the sky. A practical tutorial from Sky and Telescope magazine editor Alan MacRobert.