Bass Guitar Terminology

Couple questions below?
1) It is a bass guitar as important as the rest of the band, because most of the bands that you can not really hear that well. I only know one band where you can hear the bass, which is the tool with bass lines that are repetitive and etc. 2) What should I look for when I buy a bass guitar? In general, it is. 3) The low guitar easier to learn because it has four guitar strings unlike normal that is six or is it so difficult and challenging? And if you could fill me with some terminology about music or just below. For example, what is a riff? Sorry for a lot of questions, but it really help me. Thanks in advance.
1.Well, yes, a low is very important, because if the bass player is bad, you can hear him, and he makes music sounds unorganized. But many of the bands you can hear low, Rush for an example. 2. Gameplay remains in harmony as long as you're comfortable with it. 3. No, many ways to Bass is stronger in its own way. 4. A riff is a series of chords or notes that generally is the basis of the song. As, Smells Like Teen Spirit, the early "riff is the riff" of music.
Franco & le T.P. O.K. Jazz - Fabrice (Franco) 1980 part 1