Confused between bandwidth and frequency
"Bandwidth" has several different meanings. Among others, it can refer to either a frequency range or to data rate in bits/second. You have to use the context to figure out which is meant.

These two notions of bandwidth are not directly related, but a signal with a wider frequency range (i.e., higher signal bandwidth) can usually transmit data at a higher rate (i.e., has higher data bandwidth). However, the relation also depends on how much noise is present.