For example, to understand the name 2-methylpropan-1-ol you need to take the name to pieces.

The prop in the middle tells you how many carbon atoms there are in the longest chain (in this case, 3). The an which follows the prop tells you that there are not any carbon-carbon double bonds.

Types of carbon-carbon bonds

Whether or not the compound contains a carbon-carbon double bond is shown by the two letters immediately after the code for the chain length.

code    means

an        only carbon-carbon single bonds

en        contains a carbon-carbon double bond