There's no harm in picking up some books on layout wiring; often they can be found at your local library, or at used book stores for a couple bucks each. If you're getting started in model trains today, it's probably easier to go DCC--it greatly simplifies wiring vs. the complexity and effort (and hidden expense!) of wiring a layout for DC block control, even if the initial investment is a bit higher (a $250 command station and 2 wires vs. a $50 power pack and weeks designing and wiring a block control panel). If your plan is to build a shelf layout or a 4x8 layout, you can start out with a DC pack just to whet your appetite, but DCC offers a lot more. For that shelf/4x8 size layout, you probably don't need more than a starter DCC set (Digitrax Zephyr Express or NCE equivalent) and a couple of decoder-equipped locomotives, and then gradually build your way up as you gain skills and experience. I'm still relatively new to DCC myself (I made the jump in 2021-22) but not to model railroading, and I found both of these pages helpful:
DCC Wiki:
https://dccwiki.com/Main_Page
Wiring for DCC:
https://wiringfordcc.com/intro2dcc.htm
It's easy to get lost down a complexity rabbit hole, but DCC can be very simple and straightforward, at least in terms of physically wiring the layout.