Welcome to homebrewing! The one thing that you will learn quickly is that every possible thing you can do has multiple points of view. You will find the following topics are constant points of debate:
- All grain vs Extract
- Bottle vs Kegging
- Primary vs Secondary
- Glass Carboys vs Plastic Ones
- etc, etc, etc.
The best advice is to experiment, keep great notes and find what works best for you.
I will transfer beer to a secondary (carboy) to free up the primary fermentation bucket/carboy. Some of the styles like Barley Wines, Belgiums, Imperials, should age longer so those tend to get racked toa secondary. Others like wheat, IPAs, ambers, etc stay in the primary until ready.
There is a ton of great information on this site and an even better group of people who are willing to help. For the most part, anything that you have a question about has probably been asked so search around. If you don't find anything, ask and as your initial post shows, we are all eager and willing to share our opinions.
Good luck and enjoy