A beginner snowboard is specifically designed to make your first seasons easier and more fun. These boards feature soft flex and rocker or flat profiles, which means they're forgiving when you make mistakes and easier to turn. Most importantly, they reduce those dreaded edge catches that can slam you down hard.
It's tempting to buy a stiffer, more advanced board thinking you'll grow into it, but that's one of the biggest mistakes new riders make. A board above your ability level will fight you on every turn, making learning slower and more frustrating. You'll spend more time falling and less time actually progressing.
The tradeoff is that beginner boards do have a limited performance ceiling—you'll likely outgrow it after a few seasons. But that's actually fine. By the time you're ready for a more responsive board, you'll have the skills to know exactly what kind of riding you want to do next.