Experienced homebrewers often like to scare beginners with horror stories of all the nasty things that will happen to their beer if they don’t use a secondary. My opinion is that this step is unnecessary for most beginners, and is more likely to cause infections for inexperienced brewers.
That said, they can be very useful under certain circumstances.
If you have questions about secondaries, we have created a page on DrunkMansGuide.com that details more than you probably care to know about conditioning and secondary fermentation. You can get to the article here: “Do You Need To Use A Secondary Fermentor?”
Today’s Featured Mixed Drink Recipes: